Best Navigation Tools for Survival: Map, Compass, GPS, PLB

Navigation tools compared

No single tool covers every case. Electronics are fast and easy until the battery dies. Paper and a compass are slow to learn but always work.

Tool	Needs power	Works with no cell signal	Can call for help	Main weakness
Paper map	No	Yes	No	Takes skill; can get wet or torn
Baseplate compass	No	Yes	No	Takes skill; thrown off by metal and magnets
Handheld GPS unit	Yes	Yes	Only models with a built-in messenger	Batteries; learning curve
Phone with offline maps	Yes	Yes, if maps are downloaded	Only by call or text when there is service	Battery life; fragile
PLB	Built-in battery	Yes	Yes, SOS only	One-way; no messages
Satellite messenger	Rechargeable	Yes	Yes, SOS and text	Usually needs a paid plan
Altimeter watch	Yes	Yes	No	Needs regular calibration

Paper map

A topographic map shows hills, valleys, streams and trails with contour lines. The USGS 1:24,000-scale maps, called 7.5-minute quadrangles, are the classic choice in the US. You can download them free through USGS topoView or The National Map.

Paper copies are sold through the USGS Store. Many parks and trail groups also sell waterproof trail maps. Keep any paper map in a zip-top bag or map case.

For home emergencies, a paper road map matters just as much. Ready.gov lists local maps as part of a basic emergency kit. Mark two ways out of your area on it.

Compass

A baseplate compass is the most useful type for most people. Look for these features:

• A rotating bezel marked in degrees (0–360)
• A clear base with a ruler for map work
• A direction-of-travel arrow
• Adjustable declination, if you can afford it
• A sighting mirror (optional, also useful for signaling)

Set your declination

A compass points to magnetic north, not true north. NOAA defines declination as the angle between the two. It changes by location and slowly over time.

Look up your area’s value with the NOAA declination calculator before a trip. Then set it on your compass, or add or subtract it by hand. Keep the compass away from phones, knives, car hoods and magnets when you take a reading.

Take a bearing from a map

1. Lay the compass edge on the map from where you are to where you want to go.
2. Turn the bezel until its north-south lines match the map’s north-south grid lines.
3. Lift the compass and hold it flat in front of you.
4. Turn your body until the red needle sits inside the orienting arrow.
5. Walk where the direction-of-travel arrow points.
6. Pick a landmark on that line, walk to it, and repeat.

Practice this on a short local trail before you need it.

Handheld GPS unit

A dedicated GPS unit is tougher than most phones and is built for outdoor use. Many models run on AA batteries, which you can swap in the field. Some also include a satellite messenger.

• Load maps for the area before you leave home.
• Mark a waypoint at your car or camp when you start.
• Carry spare batteries for every day of your trip.
• Learn the menus at home, not on the trail.

Phone with offline maps

A phone is the tool most people already carry. The National Park Service warns not to rely on it, because there may be no cell coverage. It also notes that searching for a signal drains your battery fast.

To make a phone useful for navigation:

1. Download offline maps for the whole area before you leave.
2. Charge the phone fully and carry a power bank and cable.
3. Switch to airplane mode until you need the phone, as the NPS suggests.
4. Turn the screen brightness down.
5. In cold weather, keep the phone in an inside pocket. Cold drains batteries faster.
6. Take a photo of the paper map as a backup.

PLB vs satellite messenger

Both use satellites to call for help where phones don’t work. They work in different ways.

Personal locator beacon (PLB)

NOAA describes PLBs as small, portable units that you turn on by hand. They send a distress signal on 406 MHz to the international Cospas-Sarsat system. Models with a GNSS (GPS) chip can send a position accurate to about 100 meters.

NOAA says a PLB’s battery should run for at least 24 hours once activated. A PLB sends an SOS only. You cannot send a message or know who is coming.

Registering a PLB

Beacon registration is required by federal regulations (47 CFR Parts 80, 87 and 95). NOAA says registration is free and helps rescuers respond faster.

1. Register online at beaconregistration.noaa.gov.
2. List emergency contacts who know your trip plans.
3. Verify your details every two years, as NOAA requests.
4. Update the record right away if you sell the beacon or your contact details change.
5. Test only with the beacon’s self-test feature, following the maker’s instructions.

Turning on a beacon when you are not in distress counts as a false alert. Store it so it cannot switch on by accident.

Satellite messenger

A satellite messenger lets you send and receive short texts. Most also share your track and have an SOS button. Most need a paid subscription to work.

A messenger lets you tell rescuers what is wrong. It also lets you tell family you are fine but running late.

NOAA Fisheries requires its at-sea observers to carry a PLB as their main emergency device. It treats two-way messengers as a backup, not a replacement.

Feature	PLB	Satellite messenger
Sends SOS	Yes	Yes
Two-way text	No	Yes
Track sharing	No	Most models
Ongoing cost	Free NOAA registration	Paid plan usually required
Power	Long-life built-in battery	Rechargeable
US registration with NOAA	Required	Not applicable

Altimeter watch

An altimeter watch measures air pressure to estimate your height. Compare that height with the contour lines on your map. This tells you where you are on a slope or ridge.

Weather changes air pressure, so the reading drifts. Calibrate it at the trailhead and at any spot with a known height, such as a marked summit or saddle.

What to carry

Day hike on marked trails

• Paper map of the area in a waterproof bag
• Baseplate compass
• Phone with offline maps, fully charged
• Small power bank and cable
• Trip plan left with someone at home

The NPS suggests leaving your plan with a trusted person who is not on the trip. Include where you are going, who is with you, and when you will be back.

Remote or backcountry trips

• Everything on the day hike list
• PLB or satellite messenger
• Handheld GPS, or a second phone power source
• Spare batteries for each device
• Altimeter watch for mountain terrain

See our wilderness survival tips for beginners for more trip planning.

Home disasters and evacuation

• Paper road map with two evacuation routes marked
• Family meeting places written on the map
• Phone offline maps for your region
• Car charger and power bank
• Compass in the car kit

Build these into your evacuation plan and your family communication plan.

Practice before you need it

1. Find your house on a USGS map and match three nearby landmarks.
2. Take a bearing to a landmark and walk to it.
3. Mark a waypoint in your GPS or phone, walk away, and navigate back.
4. Calibrate your altimeter at a known height.
5. Run your PLB self-test, following the maker’s instructions.

Common mistakes

• Carrying a phone as your only map.
• Forgetting to download offline maps before you lose signal.
• Ignoring declination.
• Reading the compass next to a phone or car.
• Never registering a PLB, or never updating the registration.
• Buying a satellite messenger and letting the plan lapse.
• Learning to use the gear for the first time when you are already lost.

Sources

• 406 MHz Emergency Distress Beacons — NOAA SARSAT
• Frequently Asked Questions — NOAA SARSAT
• Beacon Registration Brochure — NOAA SARSAT
• Two-Way Satellite Communication Devices — NOAA Fisheries
• Magnetic Declination — NOAA National Centers for Environmental Information
• How do I find, download, or order topographic maps? — U.S. Geological Survey
• Hike Smart — National Park Service
• Ten Essentials — National Park Service
• Build a Kit — Ready.gov (FEMA)