Sailing Safety Guides
Electronics Loss
Loss Of Electronics And Navigation Backup
If the screens go black, the boat is not automatically lost. The first job is to stop panic and protect the information you still have.
You may know your last position, course, speed, wind, current, nearby land, depth trend and the direction you were already going. That is enough to start making orderly decisions.
First Principle
Do not spin around mentally or physically
When electronics fail, the most dangerous first reaction is confusion. The skipper may start changing course, opening lockers, restarting devices, searching for chargers and guessing. Meanwhile the boat keeps moving.
Stop and make a calm navigation mark in your head and on paper: where were we, what course were we steering, what speed were we making, what time is it, what is the wind doing, and what dangers are near?
Immediate actions
- Keep the boat safe: steer, reef, heave-to or slow down if needed.
- Write the time of failure.
- Write last known position if you have it.
- Write course steered, approximate speed, wind direction, current estimate and sea state.
- Protect battery power for VHF, lights, bilge pumps and emergency communication.
- Switch to compass, paper chart, log and watch.
- Do not change course unless there is a reason.
Even a rough note is better than memory after stress has been working for an hour.
Use what still works
- Magnetic compass.
- Handbearing compass.
- Paper chart or pilot book.
- Depth sounder if still powered.
- Log, watch and estimated speed.
- VHF direction or contact with other vessels if appropriate.
- Handheld GPS, phone or tablet if charged and protected.
Protect independent backups
Do not let every backup depend on the same failure point. A handheld GPS, phone, tablet, power bank, paper chart and handheld VHF should not all be useless because one charger, one inverter or one wet locker failed.
- Keep one backup device switched off and dry.
- Keep charging cables in a known dry place.
- Keep a written emergency position routine near the chart table.
- Consider a small waterproof notebook for hourly position estimates.
Dead reckoning in plain words
Dead reckoning means continuing from the last known position by estimating course and distance over time. It is not magic and it is not perfect. It is simply better than guessing.
- Start from the best known position.
- Draw or write the course steered.
- Estimate speed through the water or over ground.
- Mark positions at regular times.
- Apply known current or leeway if you can estimate it.
- Draw an uncertainty area, not a single perfect dot.
The longer you sail without a fix, the larger the uncertainty becomes. That means decisions should become more conservative, especially near land.
The compass still matters
A compass course can keep the boat from wandering in circles. If you know you were heading toward a coastline, island chain or safe open water, holding a sensible course may be enough to keep the situation orderly while you repair, rest or wait for daylight.
Keep checking whether the course still makes sense with wind, waves and hazards. Blindly holding a course into danger is not navigation.
Use depth as a warning
If the depth sounder still works, depth can give important information near land. A changing depth trend can confirm that you are approaching shallow water, a bank, a channel edge or a coastline.
Depth is not a position by itself unless the seabed pattern is very clear, but it is a valuable warning. If depth is falling and you are uncertain, slow down and make sea room.
Sun, stars and direction
You do not need to become a celestial navigator to gain useful orientation from the sky. Full celestial navigation with sextant, almanac and calculations is a real skill and should be learned properly. But simple sky knowledge can still help.
- In much of the Northern Hemisphere, the sun is generally toward the south around local noon. In much of the Southern Hemisphere, it is generally toward the north.
- Near the tropics this can change with season, so do not use it blindly.
- Polaris gives a useful north direction in the Northern Hemisphere when visible.
- The Southern Cross can help find south in the Southern Hemisphere, but it takes practice.
- The moon and stars move through the night, so use them carefully unless you know what you are doing.
The goal here is not perfect navigation. The goal is to avoid total disorientation and to support compass and dead reckoning.
Local sources still help
If the main plotter is gone, do not forget ordinary information. A lighthouse, buoy pattern, depth contour, traffic lane, ferry route, radio call, paper pilot book or familiar coastline can reduce uncertainty.
- Ask nearby traffic for weather, position cross-check or safe-water information if needed.
- Use depth trend as warning near land, but do not invent a precise position from one sounding.
- Use large safe targets: open water, a wide approach, daylight landfall or a known anchorage.
Simple dead-reckoning log
Write one line at regular intervals. The note is more important than neat navigation.
| Time | Write down |
|---|
| Now | Last known position, course steered, speed estimate, wind and current. |
| Hourly | Course, speed, sail changes, engine use and depth if available. |
| Near land | Bearings, lights, soundings, traffic and the reason for any course change. |
If you are offshore
Offshore, electronics failure may be frightening, but there may be time. The big risks are panic, wrong course changes, using battery power badly, and arriving near land with too much uncertainty.
- Slow the boat if it gives better control and time.
- Rebuild the navigation picture from log, compass and last known fix.
- Call a position and situation update if needed while communications still work.
- Steer for a large safe target, not a narrow entrance.
- Wait offshore for daylight if landfall uncertainty is high.
If you know roughly where land is, and you keep a controlled direction instead of wandering, you have a chance to solve the problem step by step.
If you are near land
Near land, loss of electronics can become urgent. The answer is usually to create margin.
- Slow down.
- Move away from hazards if you know the safe direction.
- Use depth, visual bearings, lights, buoyage and sound signals.
- Do not enter a difficult harbor on guesswork.
- Call for local guidance if needed.
- Anchor in safe depth if that is safer than continuing.
After power or electronics return
- Do not trust the first position blindly; compare it with your dead reckoning.
- Check battery voltage and charging source before turning everything back on.
- Find the cause: water, loose connection, blown fuse, overloaded inverter, low battery, failed charger or device failure.
- Update the log with outage time and estimated track.
- Keep the backup method running until you are confident again.
How this connects to SailingKSF
Loss of electronics connects to power safety, calling for help and departure preparation. The better the boat is documented, the easier it is to know what can be switched off, what must stay alive, and where the backups are stored.
Power And Battery Safety Calling For Help Leaving Harbor Check
Read More
Good sources for going deeper
- USCG Navigation Rules - Official USCG navigation-rules text, useful for lookout, safe speed, collision risk, lights, shapes, anchoring, towing and distress signals.
- NOAA United States Coast Pilot - Official coastal-pilot publications with harbor, approach, current, danger and local-navigation information for U.S. waters.
- NOAA U.S. Chart No. 1 - Official chart-symbol reference. Useful for understanding lights, marks, soundings, dangers and symbols before entering unfamiliar waters.
- World Sailing Offshore Special Regulations - Offshore racing rules, but also a useful structured benchmark for yacht safety equipment, storm preparation, emergency steering, liferafts and training.
App Connection
Use this together with KSF Passage Companion
The articles are easier to use on a real boat when your own boat details are already written down.
- Store where safety gear, tools, spares and manuals are located.
- Keep boat-specific checklists for night, heavy weather, departure and emergencies.
- Use logbook notes for failures, chafe, repairs and weak points that should be checked again.
Open Passage Companion Open Printable Cards
Keep moving from known facts
The safest thinking after electronics failure is simple: preserve position, preserve direction, reduce risk and avoid inventing certainty.
No public comments yet. You can be the first to add feedback.