Follow me!">
If a radio claims a range of 50 miles, this means you should be able to communicate with someone up to 50 miles away in optimal conditions. This video goes over all of the features of some FRS radios as well as range testing. This changed around 1989 so that only individual people can obtain licenses. We think that both can be advantageous for different reasons. Emergency/Disaster Relief Interoperation Voice Channels of the amateur radio Global ALE High Frequency Network: Emergency channels 9 (27.065MHz AM) and 19 (27.185MHz AM), GMRS: 462.675MHz is a UHF mobile distress and road information calling frequency allocated to the, PMR446 (Europe): Mountain Rescue Channel 7 analog (446.08125 MHz) , CTCSS 85.4 Hz (Channel 7/7 in most radios, not all), This page was last edited on 26 November 2022, at 10:20. Display as a link instead, GMRS shares the same 462 MHz and 467 MHz frequencies as the Family Radio Service (FRS). 4) or Have a Ham license(no license fee) and use abundant number of open repeaters. I've reached other Jeep drivers on the trail who were monitoring or using the channel for communications both within and outside their respective groups. The chart below lists these frequencies, along with their channel numbers, maximum allowable power, and maximum allowable bandwidth. These extra channels are simply existing FRS/GMRS frequencies with hard coded tones, and fixed low power on the 467 MHz channels. Today, I am going to discuss Family Radio Service (FRS) and General Mobile Radio Service (GMRS) and the differences between the two. 282.8MHz Joint/combined on-the-scene voice and DF frequency used throughout NATO, 406MHz / 406.1MHz - Cospas-Sarsat international satellite-based search and rescue (SAR) distress alert detection and information distribution system, Emergency Centre of Activity (ECOA) frequencies informally established by the. Part 95 Subpart E. You can find information about GMRS licensing in the rules. A GMRS system licensed to a non-individual prior to July 31, 1987 is also eligible for renewal, but the licensee may not make any major modification to the system. Usually used with CTCSS 141.3 Hz (Motorola QC #22). Accordingly, the power of an FRS radio is limited to that of watt. FRS radios generally have quite a bit less power at just half a watt. "550" for. WebFRS 2-way radios are lower-powered compared with GMRS 2-way radios. The simple truth is that it couldnt be, and many people were operating on GMRS frequencies without licenses. FAST SAME-DAY SHIPPING The rules for GMRS limit eligibility for new GMRS system licenses to individuals in order to make the service available to personal users. Thanks! It's 12.5khz but you can crank it up to 25khz. The fcc doesn't allow much chances for the gmrs radio nor allow any modifications. This feature causes the transmitter to send a sub- I purposely left my inquiry as general as possible to allow discussion that would be useful fr anyone with the same question. Upload or insert images from URL. Ingrams industry ranking lists are your go-to source for knowing the most influential companies across dozens of business sectors. There are 30 GMRS channels with a bandwidth of 25 kHz (20 KHz authorized bandwidth) or 12.5 kHz as outlined below: A GMRS licensee may use a combination of portable, mobile, fixed and repeater stations consistent with the operational and technical rules in Subpart E of Part 95. Equipment can be obtained from many sources, such as radio dealer and WebVery well packed, very responsive. Large, Easy-To-Read Backlit LCD Wed love to hear your thoughts or answer any questions you have. (This procedure May take a long time or never) Again ham radio has no defined emergency channel. Emergency Radio Communications (EmComm) Info GMRS (General Mobile Radio Service) Band & License Info MURS (Multi-Use Radio Service) Band Info FRS (Family Radio Service) Band Info FAQ Two-Way Radio Frequently Asked Questions BSR Two-Way Radio Promos, Discounts & Coupon Codes Blog News Tutorials Promotions You must cooperate in the selection and use of the channels in order to make the most effective use of them and to reduce the possibility of interference. I still monitor 675 while I drive mostly out of habit. It is a suggested channel for emergency use (just like channel 9 on CB). Web462.675 MHz (and its corresponding 467.675 MHz repeater pair) has long had an informal designation as an emergency/traveler assistance frequency. The ACS-CERT Communications Plan uses the WebGMRS is allotted 30 frequency channels in the vicinity of 462 MHz and 467 MHz. channel 15) but this is uncommon. The ONLY Emergency Channel is in the licensed GMRS band @ 462.6750 @ 25 KHz with a typical PL of 141.3Hz for R.E.A.C.T . After a license expires, an individual must request a new GMRS license. Please leave them in the comments below. The fact I can use repeaters and talk to folks around the country is just gravy. Except 2m is VHF and GMRS is UHF so you would want a dual band radio. Survivalandmore.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. The General Mobile Radio Service (GMRS) is a licensed radio service that uses channels around 462 MHz and 467 MHz. GMRS radios, on the other hand, use specific frequencies within that same band designated for FRS radios: 462-467 MHz. 172.5MHz U.S. Navy emergency sonobuoy communications and homing use. WebGMRS channels are also sometimes referred to. GMRS came about in the early 1940s and was meant to be used by both private citizens and businesses. Joined Mar 20, 2004 Messages 1,825 Location Lewis Center. The UV-5R transmits and receives on 136-174 MHz (VHF) and 400-520 MHz (UHF), which includes FRS/GMRS, public safety channels, and amateur ham (amongst others). Note: Your post will require moderator approval before it will be visible. Your link has been automatically embedded. Before about 1989, individuals and organizational entities could obtain licenses to operate this band. So, while you may well find emergency or other services in any given area, I would certainly not count on it. To corner GMRS channels including repeaters. I am sure the same will happen with my usage of GMRS with CB on trips. GMRS will have 30 total channels: This means 22 FRS/GMRS channels plus 8 repeater channels. November 3, 2020 in General Discussion. under In 2017, the FCC expanded GMRS to also allow short data messaging applications including text messaging and GPS location information. Whether using rechargeable or disposable batteries, when they begin to lose their charge, range will suffer. Zip Code searches can use the This frequency chart also applies to FRS, or Howdy. Most consider 675 to be the unofficial "travelers aid" or "emergency" channel. However there are certainly no restrictions on using it for a Is it 20kHz or 25kHz ? The GMRS is available to an individual (one man or one woman) for short-distance two-way communications to facilitate the activities of licensees and their immediate family members. Enter walkie-talkies and radio. You must have JavaScript enabled in your browser to utilize the functionality of this website. Note that the old GMRS channels (the 462 MHz splinter channels and the 462/467 repeater channels) were not required to narrowband. Copyright 1995-2023 eBay Inc. All Rights Reserved. If you have an account, sign in now to post with your account. They allow for greater range. So, while you may well find emergency or other services in any given area, I would certainly not count on it. This frequency is monitored by all U.S. Navy ASW aircraft assigned to a SAR mission. I was browsing through the GMRS rules and I came across this: 95.143 Managing a GMRS system in an emergency. Report the spill However there are certainly no restrictions on using it for anything. WebThe Morrow County Sheriff's Office 9-1-1 Communications Center is the Public Safety Answering Point for Morrow County. By using this site, you agree to our Terms of Use and Guidelines. Someone has to be at the other end. My latest radio is 80watts. This amount is subject to change until you make payment. Since most CERT members will not have GMRS radios, use FRS Channels 1 through 14 for CERT Comm Plan tactical use. If we are in the woods with our Jeeps I still prefer the scan set up because if someone wants to talk to me and they key up I will hear them and be able to respond. 16 for off-road and 19 for road traveljust like CB. This would allow others to aid in rescue and possibly daisy chain communication back to the nearest emergency personnel. Since there is no GMRS season, your license is also good for 10 years. Such channels are known as distress, safety and calling frequencies. immediately . You can expect a range of about 5-25 miles depending on terrain and weather conditions. 3.0 for use in GMRS (Part 95) and Amateur Bands (Part 97). law enforcement, emergency agency's etc..) or by using their radios(this will cause a really big trouble.), the situation is once concidered anyway(never ignored). This is still about 5 times more powerful than a toy walkie-talkie. You cannot directly interconnect a GMRS station with the telephone network or any other network for the purpose of carrying GMRS communications, but these networks can be used for remote control of repeater stations. These radios are often sold as walkie-talkies and cannot exceed 2 watts, so anything you hear on these channels is probably going to be extremely close, no more than a mile or two away. The most common use of GMRS channels is for short Here is a link. Same Day Shipping! These licenses are very much like a fishing or hunting license in which you apply and pay for it, but it does not require any kind of testing. Of course if you want to use a radio for any distance then VHF is the way to go. It may not display this or other websites correctly. Use of some distress frequencies is permitted for calling other stations to establish contact, whereupon the stations move to another frequency. Any of these models will give you high power GMRS channels, including repeater channels. Note that unlike other radio services (notably CB and Amateur) there is no general assumption about contacting strangers or about use while traveling away from home. (in favor of manufacturer ?). Those labeled as a higher optimal range of 35 miles and above with the most wattage, add-ons and options are considered the high-end models. Originally called Class A Citizens Radio Service, GMRS can be considered the in-between spot for CB radio and Ham radio. This means there are few obstructions between you and who you are communicating with. And you wont need to buy a crappy GMRS radio. 2) the gmrs operator must find the repeater closest around (find the right tone also). TECHNICAL & INSTALLATION RESOURCES | 80,000+ SATISFIED CUSTOMERS The difference is that GMRS radios have designated channels within those frequencies that arent available to FRS radios. Both utilize Ultra-High Frequency (UHF) on Frequency Modulation (FM) bands meaning they will give you a static-free sound. This allows the user to squelch out many undesirable transmissions and conserve battery life. This amount includes applicable customs duties, taxes, brokerage and other fees. WebThe Motorola convention names Channels 8 through 14 as FRS only and Channels 15 through 22 for as GMRS only frequencies. maybe dismissed. [2] Digital 406MHz models became the only ones approved for use in both commercial and recreational watercraft worldwide on January 1, 2007.[3]. Great seller! Most 22 channel radios of this type which were formerly marketed as GMRS/FRS combination radios (radios that are not capable of repeater operation, do not include the repeater input frequencies, have a maximum power of 2 watts and have a non-detachable antenna) have been reclassified as FRS radios. You can post now and register later. This entry was posted in Articles, Consumer Radios and tagged GMRS, gmrs channels, gmrs frequencies on November 2, 2022 by Rick. The maximum power level of a GMRS is limited to 50 Watts. Its use has been phased out in favor of the Global Maritime Distress Safety System. However, all previous licensees were grandfathered in. Licenses are issued for a ten-year term and can be renewed between 90 days prior to the expiration date and up to the actual expiration date of the license. MEDIA KIT| I still have CB because I wheel with an off road club and that is what they all use. https://jeepjamboreeusa.com/cb-replaced-by-frs-gmrs-two-way-radios/, Off Road+Plus and TrailCam Off-Road Camera, GPS and ALT not displaying in Off-Road Pages. Product was successfully added to your shopping cart. If you travel a lot, CB and/or Ham would probably serve you better in an emergency situation. this GMRS Radio Range chart was created to convert the manufacturer's advertised range to an actual, real-world range and assigned to a tier as a radio range rating. when travelling. Normally, you and your family members would communicate between yourselves directly or through a repeater station. Dosen't allow "mayday" calls except aboard a ship. The communications may also be with mobile stations from other GMRS systems also with permission from the licensee to communicate through the mobile relay station. FRS radios with 14 (or fewer) channels and up to 1/2 watt power output are still manufactured and sold. as "de facto" calling and emergency channels, especially. Note: A discrepancy has been noted with Federal documents as well as some FRS/GMRS radios, which list Channel 8 as 467.5675 MHz. You will also receive an FCC issued call sign when you get your license for GMRS. The links below will allow your organization to claim its place in the hierarchy of Kansas Citys premier businesses, non-profit organizations and related organizations. Was This Article Useful? It seemed that devices like baby monitors, garage door openers, and even radio-controlled toys were using up all the lower frequencies that walkie-talkies had been using. WebBy Marty Woll N6VI, Amateur Radio Emergency Service and Member, purchase all the same make and model so that everyones Channel 3 is the same. These radios can be handheld, mobile, or fixed. I don't believe it ever was enforced, but certainly now it would not be. WebThe Midland XT511 is a channel GMRS emergency dynamo crank radio with NOAA All Hazard/Weather Alert and AM/FM. How to use the PF Key Quick Guide on the Wouxun KG-935G Plus | Video, What's changed with the KG-935G PLUS GMRS Radio - PART 2, What's changed with the KG-935G PLUS GMRS Radio - PART 1, Video introduction to the Wouxun KG-935G Plus, How to turn the Wouxun KG-1000G into a GMRS repeater, What to do when the battery pack does not charge, How to install the Baofeng USB programming cable and software. Delivery times may vary, especially during peak periods. You are using an out of date browser. One of my GMRS repeaters is on 675 in a county park for this reason but is rarely if ever used. This is great for activities like camping or even for caravan travel. Clear editor. Pasted as rich text. Back in my REACT days there was a push for .675. It has 200 programmable channels and unlimited repeater support. Looking for mobile GMRS high power. I will definitely keep this in mind when mobile! The XT511 also features a flashlight, an AM/FM radio, and a NOAA weather alert radio. They are typically handheld two-way devices. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. Most FRS and GMRS radios have tone encoders and decoders that may go under the name privacy code, PL or the like. REACT where I live in Dallas, Texas has a 600 and 675 repeater in downtown, the 675 is open for anyone to use however it's reserved for REACT during events. Sign up for our newsletter today! and a side note to using any frequency in a life or death situation, its true BUT that is if you have no other means of contacting help. KCChiefs9690 Delaware County. While an FRS radio does not require licensing, it is very limited in power and range. And not having to study and take a test was good. The FCC service rules for the GMRS are located in 47 C.F.R. WebI've heard police dispatch on GMRS channels when I was vacationing in Cape Canaveral. It was widely used by REACT-affiliated GMRS systems for a long time as a nationally standardized access point for REACT's traveler assistance and other emergency services. WebDont know what channel is best to use on GMRS? I just found that they infamous "Line A" is no longer a practical issue, even though the FCC rules have not been updated. Emergency 16/9 Channel Monitoring - It can scan one or both of these emergency channels regularly within normal scanning cycles. In 2017, the FCC updated the GMRS by allotting additional interstitial channels in the 467 MHz band, increased the license term from 5 to 10 years, allowed transmission of limited data applications such as text messaging and GPS location information and made other updates to the GMRS rules to reflect modern application of the service. Best Radios for FRS, GMRS, MURS Operations and Monitoring Radio Service, GMRS can be considered the in-between spot for CB radio and Ham, 5 Watts of power, up-gradable to 50 Watts. While the FCC determines the frequencies and privacy tones used in the FRS and GMRS radio services, channel and tone numbering is left up to the manufacturer. The PLB needs to be registered with NOAA and in the event of an emergency the United States Air Force Rescue Coordination Center in Florida receives the notification - investigates the request - coordinates with federal, state, and local officials, and determines the type and scope of response necessary. Licensing, range, and power are the most important differences as these factors can help you choose one over the other. I reviewed list again, and they do advocate a GMRS frequency as well. Note that unlike other radio services (notably CB and Amateur) there is no general assumption about contacting strangers or about use while traveli On this Wikipedia the language links are at the top of the page across from the article title. For suggested and unofficial channel usages see the. Theres never a fee to submit your organizations information for consideration. Survivalandmore.com also participates in other affiliate programs, and we sometimes get a commission through purchases made through our links. If you have heard of, or owned a dual GMRS/FRS radio, you might wonder how something like this could have been regulated by licensing. [or I don't have service). For me like with my CB when traveling I set my mobile unit on scan as it then scans all frequencies. If we are in the woods with our Jeeps I still You may apply for a GMRS license if you are 18 years or older and not a representative of a foreign government. WebThe Best GMRS Channel For Highway Use - YouTube 0:00 / 8:14 What Is The Official GMRS Road, Trucker & Travel Channel? The Wouxun KG-1000G is our most popular GMRS mobile and widely considered to be the best on the market. Furthermore, anyone is allowed to use either system as long as they are not a representative of a foreign government. Our Center has the responsibility of answering 911 There is also a designated emergency channel at 462.675MHZ that is monitored by many clubs and other GMRS operators. WebThe General Mobile Radio Service (GMRS) is a licensed radio service that uses channels around 462 MHz and 467 MHz. One of Midland's most powerful GMRS Radios, Your Choice of Midland MicroMobile 2-Way Radio. Of course, they are limited to 2 watts on the high powered channels, but since they can now use it, the Line A rule has no purpose. You cannot paste images directly. Yes but before you do that, Try calling out on one of the local ham repeaters for for help or any simplex freqs you know are active before you go and start calling some one on a local PD and FD freq You should of read up on that while you were studying for your tech license.. Commercial, Professional Radio and Personal Radio, RFinder B1+ Operation Aboard The Carnival Celebration Cruise Ship, Wideband FM on TK-5810H(G) K2 HW ver. Thus, the frequencies between 462 MHz and 467 MHz were designated for walkie-talkie usage and became known as Family Radio Service. We all set a frequency for group communication, but if we ever needed help in an emergency it would be great to have all radios automatically scanning for a pre-set Emergency Channel. GMRS-specific frequencies are FM simplex or duplex with 8 channels at 462 MHz and 8 channels at 467 MHz in the UHF band. Harris Momentum HDP150 UHF 400-470 MHz Digital DMR & Analog Radio GMRS FPP (#234733270603) v***i (549) Past month. The NIFOG includes rules and regulations for use of nationwide and other interoperability channels, tables of frequencies and standard channel WebGeneral Mobile Radio Service (GMRS) Radio Frequency Chart GMRS has been around for many many years. Compare that with typical GMRS, CB , FRS, Baofeng or other any 5 watt unit. FRS/GMRS. Delivery time is estimated using our proprietary method which is based on the buyer's proximity to the item location, the shipping service selected, the seller's shipping history, and other factors. TECHNICAL & INSTALLATION RESOURCES80,000+ SATISFIED CUSTOMERS. Same for ham repeters. The stations must be within the territorial limits of the fifty United States, the District of Columbia, and the Caribbean and Pacific Insular areas. Repeaters are simply a type of antenna that repeats what comes to the receiver. Aug 1, 2006 #15 cellblock776 said: Emergency channels CB radio- Ch 9 Marine-Ch 16 Civilian Air-121.5 Military Air-243 For additional information, see the Global Shipping Program, Motorola CDM1250 UHF (450-520 MHz) 64 Channels GMRS TESTED. The cops were analog and clear as a bell; the hospital was probably intermodulation from some kind of high-power paging system, judging by what the speaker squealed out. This entry was posted on November 2, 2022 by Rick. However, in emergency situations, there is no guarantee your family will end up close enough for these to be useful. WebGMRS, short for General Mobile Radio Service, is a mobile UHF 2-way radio service in the U.S. that requires users to obtain a license. None of the GMRS channels are assigned for the exclusive use of any system. The GMRS-V2 has a built-in FM radio and plenty of programmable scanner channels, which you can set up to receive NOAA weather warnings and other local Similar to the X-Talkers, these GMRS radios also include our trademark (Some previously licensed non-individual systems are allowed to continue using GMRS.). Many of these models All of these features can be life-saving when cell towers or even the entire power grid is down. Channels 1 7 are shared with the GMRS. Radio frequency designated for emergency communication, VHF, UHF calling frequencies can also be used to make emergency calls, Emergency position-indicating radiobeacon station, "USCG: Commercial Fishing Vessel Safety Program - 13th Coast Guard District - Guardians of the Pacific Northwest", "HF Distress and Safety Watchkeeping Schedule", "Recommendation M.541: Operational procedures for the use of digital selective-calling equipment in the maritime mobile service", https://ntc5.ntc.gov.ph/wp-content/uploads/2019/09/mc-04-03-2011-authorizing-the-use-of-RF-in-times-of-emergency.pdf, "IARU Emergency Telecommunications Guide", "Emergency Center of Activity Frequencies adopted by the IARU Region 1 General Conference 2005", "HF - International Amateur Radio Union - Region 1", "HFLINK - HF Automatic Link Establishment HF ALE HF Network Ham Radio Amateur Radio HF Emergency Disaster Relief Communications", https://en.wikipedia.org/w/index.php?title=International_distress_frequency&oldid=1123909705, All articles with bare URLs for citations, Articles with bare URLs for citations from March 2022, Articles with PDF format bare URLs for citations, Creative Commons Attribution-ShareAlike License 3.0, 145.000MHz (India, Indonesia & Thailand). The big difference with GMRS compared to CB, commercial radios can actually scan For additional information, see the Global Shipping Program, This amount includes applicable customs duties, taxes, brokerage and other fees. Makes sense For now, my major concern is mostly during local area commute Usually keep two REACT repeaters in my HT just in case My major This page was last edited on 27 February 2023, at 09:33. Return to Wiki pages: Family Radio Service, General Mobile Radio Service, Common Frequencies, Current FRS/GMRS Channels (effective September 28, 2017), Review of the Commission's Personal Radio Services Rules, https://wiki.radioreference.com/index.php?title=FRS/GMRS_combined_channel_chart&oldid=309639. GMRS handheld radios are usually about 5 watts, but can be up to 50 watts with modifications. This video shows you a few different radios for both services. GMRS operates on a 12.5 kHz or 25kHz (20kHz authorized) bandwidth while FRS uses 12.5kHz. FRS FRS 3: 462.6125 MHz. The unique XT511 Base Camp Radio combines communication, emergency notification and information all in one package. Research with the FCC has shown that the correct frequency is 467.5625 in keeping with the 25kHz spacing of these and the GMRS Some clarification regarding the GMRS "emergency" channel 10 would be helpful, especially as it appears to be one that can sync with repeaters which might Probably a dumb question, but here it goes Is there a specific GMRS channel that could be considered "For emergency use only" kind of an homologous to channel 9 in CB? Each licensee manages a system consisting of one or more transmitting units (stations.) GMRS, short for General Mobile Radio Service, is a mobile UHF 2-way radio service in the U.S. that requires users to obtain a license. As a two way radio, the Midland Base Camp XT511 supports 22 GMRS channels with 121 privacy codes per channel. GMRS is certainly growing fast enough that this need might not be too far off in the future. In that respect, GMRS is more like business radio. [1], Satellite processing from all 121.5 or 243MHz locators has been discontinued. This frequency is also used for direction finding (DF). MURS 151.940 MHz. JavaScript seems to be disabled in your browser. WebUSA GMRS Association Home Office Located In Canton, Texas 903-275-6069 Copyright 02-2017 This site & all its contents are copyright protected. As with FRS, radios on these channels are limited to the ERP designated. One other factor that can affect your range is your batterys strength. "God will have the last word, and it will be good!" Midland and Cobra make radios with up to 38 "Extra Channels" (for a total of 40, 50 or 60 channels depending on the model). 163.4875 A National Guard emergency communications frequency 163.5125 Military National Disaster Preparedness frequency 168.55 Emergency and 123.1MHz: Aeronautical Auxiliary Frequency (International voice for coordinated SAR operations). WebThe GMRS is allotted 30 channels - 16 main channels and 14 interstitial channels. UHF CB (Australia): Channels 5 (476.525 Address:528 S. Cherry Rd.Rock Hill, SC 29732, Sales and Support Hours:Mon - Fri / 8:00AM - 6:00PM. International distress frequencies, currently in use are: Several maritime frequencies are used for digital selective calling (DSC), and they are also monitored for DSC distress signals:[6][7]. MURS uses 5 channels in the 151 154 MHz spectrum range. The old Maxon GMRS 210+3 HT provided two programmable channels (#9 and #10), the seven GMRS interstitials (#1-7), AND had the emergency frequency fixed in And locally I get really strong intermittent interference from the local hospital. frao74 Licensees may use the eight main 462 MHz channels for Simplex Communication or Repeater outputs. Just buy a 2 meter radio the uses the GMRS frequencies. To anyone looking to acquire commercial radio programming software: JavaScript is disabled. The antenna is also removable, so you can switch it out for a more effective whip antenna to boost range. I heard somewhere 20 was for emergency situation chatter?? WebFind an Amateur Radio License Exam in Your Area. As stated above, no true designation. Thats in part because they are JavaScript is disabled. FCC GMRS Channels GMRS is becoming more popular as bubble pack walkie talkies (HT) include both GMRS and FRS channels. It never got too far but many maintain it in there minds. Sounds like a textbook cashgrab to me. I recently learned that there was some prepper movement towards establishing a channel to use for a future SHTF event. The difference is that GMRS radios have designated channels within those frequencies that aren't available to FRS radios. We think its worth the money to invest in a GMRS license. and i have not seen in quite some time a sign for cb ch 9 being monitored.
Uc Berkeley Summer Research For High School Students,
Floyd Funeral Home Obituaries Near Amsterdam,
Great Lakes Ship Models,
Articles G