What Autopilot Accessories Do and Why They Matter
Autopilot accessories are add-on components that expand what your autopilot system can do, improve how it performs in different water conditions, or make it easier to install and maintain. They are not required to run an autopilot, but they solve specific problems: a compass that works better in shallow water, a remote control so you do not have to go below deck to adjust course, a backup power supply for emergencies, or a mounting bracket that fits your particular boat type.
The accessories you need depend on your boat's size, your autopilot model, and how you fish. A kayak angler might add only a wireless remote. A larger boat running long offshore trips might use a compass upgrade, a backup battery, and a network interface to integrate the autopilot with other electronics. Understanding what each accessory does helps you spend money on what actually solves your problem rather than what sounds useful.
Key Takeaways
- Compass upgrades and flux gates improve autopilot accuracy in shallow water, around metal structures, and in areas with magnetic interference.
- Wireless remotes and control panels let you adjust course from the helm or cabin without running below deck to the autopilot unit.
- Backup power supplies and battery isolators keep your autopilot running if your main electrical system fails or your battery voltage drops.
- Network interfaces and NMEA connectors let your autopilot communicate with GPS, fish finders, and other onboard electronics for coordinated navigation.
- Mounting brackets, cable extensions, and weatherproof covers are designed for specific boat types and installation environments.
Compass Upgrades and Flux Gate Sensors
The compass is the autopilot's core sensor — it tells the system which direction the boat is pointing. The compass that comes with most autopilots works well in open water, but it can drift or lose accuracy near metal structures, in very shallow water, or in areas with strong magnetic anomalies. A flux gate compass upgrade replaces the original sensor with one that is more stable and less sensitive to local magnetic interference.
Upgrading the compass is most useful if you fish in rivers, narrow channels, or near docks and pilings where metal and magnetic fields are dense. It is also worth considering if your autopilot struggles to hold a straight course in certain areas or if you have added metal equipment (a hardtop, a large fish finder antenna, or a new engine) that has shifted the magnetic environment around your boat. The upgrade typically costs between $150 and $400 depending on the autopilot brand and the sensor type.
Installation usually requires removing the old compass housing and mounting the new one in the same location or a nearby spot with less interference. Some upgrades can be done by the boat owner; others require a technician familiar with your autopilot model. Check your autopilot manual or contact the manufacturer to confirm whether a compass upgrade is compatible with your unit.
Wireless Remotes and Control Panels
A wireless remote lets you change your autopilot's heading from anywhere on the boat — the helm, the cabin, or the deck — without running below to the autopilot control unit. This is especially useful on larger boats where the autopilot is mounted in an engine room or cabin, or on fishing boats where you might be at the rail or fighting a fish when you need to adjust course.
Wireless remotes use radio frequency or Bluetooth to communicate with the autopilot. Most are waterproof and designed to survive spray and occasional submersion. Battery life typically ranges from several months to a year depending on use and the remote model. Replacement batteries are usually standard types (AA, AAA, or coin cells) that you can find at any hardware store.
Some autopilot systems also offer hardwired control panels — secondary display units that mount at the helm or in the cabin. These panels show the same information as the main unit and let you adjust settings without moving. Panels are more expensive than remotes (often $300 to $600) but do not require battery replacement and provide a larger, easier-to-read display. Choose a remote if you want portability and simplicity; choose a panel if you want a permanent, always-visible interface.
Backup Power Supplies and Battery Isolators
An autopilot draws steady current from your boat's electrical system — typically 2 to 5 amps depending on the model and how hard it is working. If your main battery voltage drops too low or your battery fails, the autopilot shuts down. A backup power supply or battery isolator keeps the autopilot running by switching to a dedicated battery or a secondary power source when the main system falters.
Battery isolators are most common on larger boats with dual battery systems. They automatically disconnect the autopilot from the main battery if voltage drops below a set threshold, then reconnect it to a reserve battery. This prevents the autopilot from draining your starting battery and ensures you can still steer manually if the main electrical system fails. Isolators cost $100 to $300 and are usually installed by a marine electrician.
Smaller boats and portable autopilots sometimes use a dedicated backup battery — a separate deep-cycle battery wired only to the autopilot. This is simpler to install than an isolator but requires you to monitor and charge the backup battery separately. If you fish long days far from shore, a backup power system is worth the cost; if you fish close to home or in daylight only, it is less critical.
Network Interfaces and NMEA Connectors
Modern autopilots can communicate with other onboard electronics — GPS units, fish finders, chart plotters, and wind instruments — through a network interface or NMEA connector. This lets your autopilot receive course corrections from your GPS, follow a waypoint automatically, or adjust for wind and current based on data from other sensors.
A network interface is essential if you want your autopilot to work with your GPS or chart plotter. Without it, you have to steer manually or set a compass heading and hope you stay on course. With it, your autopilot can follow a pre-programmed route, hold a specific ground track (accounting for current and wind), or return to a waypoint automatically. Network interfaces are usually built into newer autopilot models, but older systems may need an add-on module ($150 to $400).
NMEA connectors are the physical plugs and cables that link your autopilot to other electronics. Most modern systems use NMEA 0183 (a serial connection) or NMEA 2000 (a faster network standard). If you are upgrading your autopilot or adding new electronics, confirm that all your devices use the same NMEA standard, or budget for a converter.
Mounting Brackets and Installation Hardware
Autopilots come with mounting hardware designed for common boat types, but if your boat has an unusual hull shape, a non-standard rudder, or a custom steering system, you may need a specialized mounting bracket. Brackets are available for sailboats, center-console fishing boats, cabin cruisers, and kayaks. They ensure the autopilot's drive arm or sensor aligns correctly with your steering mechanism.
Installing an autopilot on a boat it was not originally designed for can be challenging. The drive arm must move freely without hitting the hull, the compass must be mounted away from metal and electrical interference, and the control unit must be accessible. If your boat type is not listed in the autopilot manual, contact the manufacturer or a marine technician before buying. A wrong bracket can mean the autopilot does not work at all or damages your steering system.
Cable extensions, weatherproof covers, and protective housings are also available. These are useful if your autopilot is mounted in a wet or exposed location, or if the standard cables are too short to reach from the control unit to the drive mechanism. Budget $50 to $200 for these accessories depending on cable length and material.
Compatibility and Installation Considerations
Not all accessories work with all autopilot models. Before buying, check your autopilot's manual or the manufacturer's website to confirm that the accessory is compatible. Some brands (Garmin, Raymarine, Furuno) have large accessory ecosystems with many options; smaller or older brands may have fewer choices.
Installation difficulty varies widely. A wireless remote is usually a matter of turning on pairing mode and pressing a button. A compass upgrade or network interface may require opening the autopilot housing, disconnecting wires, and mounting new components — work that is best left to a technician if you are not comfortable with marine electronics. A battery isolator requires understanding your boat's electrical system and may involve running new wires through the hull.
If you are not sure whether an accessory will work with your setup, contact the autopilot manufacturer's support line or a marine electronics dealer in your area. Spending $50 on a consultation is cheaper than buying the wrong part or damaging your boat during installation.
Frequently Asked Questions
Do I need a wireless remote if I have a control panel at the helm?
No. A control panel gives you full access to the autopilot from the helm, so a remote is redundant. A remote is most useful on boats where the autopilot control unit is below deck or far from the steering station, or if you want to adjust course from the cabin or deck without leaving your post.
Can I add a network interface to an older autopilot?
Sometimes. Older autopilots with NMEA 0183 ports can often accept an add-on network module, but compatibility depends on the specific model. Check your autopilot manual or contact the manufacturer. If an upgrade is not available, you may need to replace the entire autopilot to get GPS integration.
What size backup battery do I need?
An autopilot typically draws 2 to 5 amps. A 20-amp-hour deep-cycle battery can run most autopilots for 4 to 10 hours depending on load. If you fish all day, a 30 or 40-amp-hour battery is safer. Consult your autopilot manual for the exact current draw, then size the battery accordingly.
Will a compass upgrade fix my autopilot if it keeps losing signal?
A compass upgrade helps if the problem is magnetic interference or drift in shallow water. If the autopilot is losing signal entirely, the problem is usually a loose wire, a failing compass sensor, or a power issue — not something a new compass will solve. Have a technician diagnose the problem before buying parts.
Can I install a mounting bracket myself?
If you are comfortable working with basic tools and marine hardware, many brackets can be installed by a boat owner. However, if the bracket requires drilling into the hull, modifying the steering system, or running new cables, hire a technician. A poor installation can affect steering performance or damage your boat.