GPS devices & accessories

First, check the interfaces: Many onboard networks use NMEA 2000 or NMEA 0183. The key factor is whether your existing system (chartplotter, autopilot, instruments, AIS/radio) needs to receive or transmit data. Also pay attention to the power supply (12/24 V) and ensure you have the appropriate cables/adapters. If you provide the model names of your existing components, we can quickly narrow down the suitable integration options.

A handheld GPS is suitable as a mobile backup, for a dinghy, and as an emergency solution. A fixed GNSS antenna (or external receiver) makes sense if the device is located below deck, if reception needs to be more stable, or if data needs to be distributed throughout the onboard network. A chartplotter with integrated GPS is the classic all-in-one solution at the helm. Many boats combine both: a fixed chartplotter/GNSS unit plus a handheld device as a backup.

For good reception, GNSS requires as unobstructed a view of the sky as possible (not under metal surfaces, not directly next to strong sources of interference). Displays/chartplotters should be positioned so that they are glare-free and easily readable (sunlight, night mode) and can still be operated in rough seas. Seal cable entries properly and provide mechanical strain relief so that no tensile forces act on the connectors.

GPS/GNSS usually provides position data without calibration, but basic settings are important for reliable onboard data: units (nm/km), date/time, position format, heading display, magnetic compass offset (if a sensor is integrated), and the correct assignment within the NMEA network. For chartplotters, map/area options and alarms (CPA, anchor alarm) are also part of a sensible setup.

Use appropriate fuses near the power source, correct wire gauges, and waterproof connectors. Route data and antenna cables as far away as possible from high-power devices (e.g., anchor winches, chargers) to reduce interference. For outdoor installation, UV protection, covers, and splash-proof mounts are recommended. With sensitive electronics, a clean installation pays off in the long run.

Very important: Make sure your device supports maps for your sailing area (inland, coastal, international) and understand how updates are handled (map, download, subscription). For regular trips in varying sailing areas, a system with simple updates and clear licensing is worthwhile. Safety-related features (shallow waters, buoys, port information) benefit from up-to-date data.

Common causes include improper installation (shielding by metal), electrical interference, loose connections, or an unsuitable installation location below deck. First, check the power supply, connectors/cables, and the antenna location. For external antennas, a location with better “line of sight” and clean cable routing often helps.