Reliable communication is a cornerstone of safety when you travel beyond the reach of cell towers. On public land in the United States, off-road drivers, overlanders and backcountry explorers need a clear plan for staying in touch with their group and summoning help if something goes wrong. This guide explains the radio services and emergency beacons regulated by the Federal Communications Commission (FCC) and the National Oceanic and Atmospheric Administration (NOAA), so you can choose tools that fit your trip and operate them legally.
Two-Way Radios for Off-Road Groups
Short-distance radios let vehicles in a convoy coordinate stops, warn about obstacles, or share route changes without relying on mobile networks. The FCC authorizes several personal radio services that are practical for off-road use. Each has different licensing rules, channel counts and power limits.
Family Radio Service (FRS)
According to the FCC’s Family Radio Service page, FRS is a licensed-by-rule service, meaning no individual license is required as long as you follow the rules. The service is designed for short-distance, two-way voice communications using small handheld radios similar to walkie-talkies.
FRS is authorized 22 channels in the 462 MHz and 467 MHz range, all shared with the General Mobile Radio Service (GMRS). The FCC’s channel table shows that channels 1 through 7 and 15 through 22 are allowed up to 2 watts of effective radiated power (ERP), while channels 8 through 14 are limited to 0.5 watt. The FCC notes that the usual range on channels 8-14 is less than one-half mile, while longer range can be achieved on the higher-power channels depending on conditions. No FRS channel is assigned for exclusive use; users must cooperate and practice listen-before-talk etiquette.
If you own an older dual-service FRS/GMRS radio, the FCC explains that devices limited to the FRS channel and power limits can be operated without a license. Radios that include additional GMRS-only channels (such as 467.5500, 467.5750, 467.6000, 467.6250, 467.6500, 467.6750, 467.7000, and 467.7250 MHz) or exceed the FRS power limits require an individual GMRS license.
General Mobile Radio Service (GMRS)
The FCC’s GMRS page states that GMRS is a licensed radio service using channels around 462 MHz and 467 MHz. An FCC license is required to operate a GMRS system. Licenses are issued to individuals who are at least 18 years old and not representatives of a foreign government. Once licensed, any family member, regardless of age, may operate stations within the system. The license term is ten years, and the FCC says you can renew between 90 days before expiration and the expiration date. After a license expires, you must request a new one.
GMRS provides 30 channels with bandwidths of 25 kHz (20 kHz authorized bandwidth) or 12.5 kHz. The service supports handheld radios, mobile units and repeater stations. The FCC notes that a GMRS user can expect a communications range of one to twenty-five miles depending on station class, terrain and whether repeaters are used. However, the FCC explicitly prohibits linking repeaters via the internet or other networks to carry communications. Repeaters may only be connected to a network for remote control purposes. None of the GMRS channels are assigned for exclusive use; licensees must cooperate and use listen-before-talk etiquette.
Citizens Band Radio Service (CB)
The FCC’s Citizens Band Radio Service page explains that CB is a private, two-way, short-distance voice communications service for personal or business use. No individual license is required. Anyone, regardless of age, may operate a CB station, with exceptions for foreign governments, their representatives, federal government agencies, and individuals under an active FCC cease-and-desist order.
CB is authorized 40 channels between 26.965 MHz and 27.405 MHz, each 10 kHz wide. The FCC designates channel 9 as reserved for emergency communications or traveler assistance. You must give priority to emergency messages on all channels at all times.
The FCC sets clear equipment rules: you may not raise the power output of a CB transmitter, and you may not attach a linear amplifier or any other type of power amplifier. There are no antenna height restrictions for vehicles or handheld devices. For antennas mounted on structures, the highest point must not be more than 20 feet above the highest point of the building or tree on which it is mounted, or 60 feet above the ground, with lower limits near airports.
Emergency Distress Beacons
When a situation becomes life-threatening and you need to alert search and rescue authorities, a 406 MHz emergency beacon is the tool recognized by the international Cospas-Sarsat satellite system. NOAA’s SARSAT program explains that these beacons transmit a digitally coded distress signal on 406 MHz, which is the only frequency satellites can detect for distress alerting. The three main types are Emergency Position Indicating Radio Beacons (EPIRBs) for maritime use, Emergency Locator Transmitters (ELTs) for aviation, and Personal Locator Beacons (PLBs) for individual use in remote environments.
For off-road travelers on land, a PLB is the relevant type. NOAA describes PLBs as beacons for anyone travelling in remote wilderness areas any time of year. They can only be activated manually and operate exclusively on 406 MHz. Some PLBs include a GNSS (GPS) chip that encodes a position in the distress signal, which NOAA says improves location accuracy down to the 100-meter level. The minimum operational battery life once activated is 24 hours.
NOAA emphasizes that registration is required by law for U.S.-coded 406 MHz beacons. The National Beacon Registration Database is available online, and registration is free. NOAA says registration is valid for only two years and you are required to re-register the beacon every two years so it can keep up-to-date contact records. NOAA also notes that even a brief inadvertent signal can generate a false alert; if a registered beacon activates by accident, the call you receive from the Coast Guard or Air Force will be a friendly one, while a false alert from an unregistered beacon may not be. Test a 406 MHz beacon only with its self-test feature or at an authorized dealer or test facility, following the manufacturer’s instructions, and never activate it unless you are in grave and imminent danger.
NOAA notes that 121.5 MHz signals are no longer detected by Cospas-Sarsat satellites, and that 406 MHz ELTs decrease the time to reach accident victims by an average of 6 hours.
Satellite Messengers
The NPS Ten Essentials page lists a two-way satellite messaging device as an additional item for some activities. These devices are not 406 MHz distress beacons, and NOAA’s registration database covers 406 MHz beacons. Check what any device you carry can and cannot do before you rely on it.
Leave a Trip Plan as Your Primary Safety Net
No radio or beacon replaces a simple, written trip plan left with a responsible person. For off-road trips on public land, your trip plan should include your intended route, vehicle description, license plate, names of everyone in the group, and a time when the contact should call for help if you have not checked in. Always confirm route legality and conditions with the land manager (MVUM, ranger district, BLM field office, or park) before you leave. A trip plan costs nothing and works independently of batteries or signal coverage.
Communication Checklist for Off-Road Trips
Use this checklist as a starting point when preparing your communication gear. Pair it with the broader equipment planning covered in our off-road gear essentials article and the off-road gear section.
- Confirm which radio service (FRS, GMRS, or CB) your group will use, and ensure every driver has a compatible, FCC-certified radio.
- If using GMRS, verify that the operator holds a valid individual license and that the license is current.
- Check that FRS radios are not modified and operate within the legal channel and power limits.
- For CB radios, inspect the antenna mounting and confirm no power amplifiers are attached.
- Register your 406 MHz PLB with NOAA and confirm the registration is up to date. Set a reminder to renew every two years.
- Test the PLB only with its self-test feature, following the manufacturer’s instructions; never activate it unless you are in grave and imminent danger.
- Pack spare batteries for all radios and a charging method appropriate for your trip length.
- Write a detailed trip plan and leave it with a trusted contact. Include a check-in time and instructions for what to do if you are overdue.
- Carry a physical map and compass as a navigation backup, as recommended by the NPS Ten Essentials.
- Review the trip preparation guide and the emergency equipment checklist for additional safety items.
Frequently asked questions
Do I need a license to use a handheld radio on the trail?
It depends on the radio service. The FCC states that FRS radios do not require an individual license, and CB radios also operate without a license. GMRS radios, however, require an FCC license. If you use a dual-service radio that can access GMRS-only channels or exceeds FRS power limits, you must have a GMRS license.
Can I rely on a satellite messenger instead of a PLB?
A satellite messenger is not a 406 MHz distress beacon. NOAA explains that 406 MHz beacons send a distress signal to the Cospas-Sarsat satellite system, and registering a U.S.-coded beacon helps rescue forces find you faster. Check what any messenger can do before you rely on it, and always leave a trip plan.
What should I do if I accidentally activate my 406 beacon?
NOAA notes that even a brief inadvertent signal can generate a false alert, and that if your beacon is registered, the call you receive from the Coast Guard or Air Force will be a friendly one. Registering your beacon and keeping the registration current is the main step NOAA asks of owners. Test only with the self-test feature as the manufacturer describes.
For more guidance on selecting and using radios, beacons and other communication tools, browse our Communication category.
