GPS and GNSS – How the technology works and how to use it on board

Discover how GPS and GNSS improve navigation, safety, and efficiency at sea through integration with autopilot, VHF radio, AIS, and PC applications.

GPS and GNSS satellites are used to provide an accurate position for a person or object almost anywhere on Earth. The technology is based on trilateration, a method that calculates position by distance to multiple satellites.

What is trilateration?

Trilateration is primarily used in surveying and navigation, including global navigation satellite systems (GNSS) such as Galileo and GPS.

Four main uses for GPS data:

1. Positioning – Determine an exact location.
2. Navigation – Move from point A to point B.
3. Tracking – Monitor movements and positions.
4. Mapping – Create current and precise maps.

These functions are important in the marine Industry Terms and can be integrated with NMEA 0183 or NMEA 2000-GPS instruments connected to other devices.

Integration of GPS with various systems

Using GPS with Autopilot

An autopilot connected to GPS is significantly more accurate than one that only uses a compass. GPS allows the autopilot to maintain course by compensating for wind and current, saving time and fuel.

Using GPS with VHF Radio

VHF radio with DSC (Digital Selective Calling) increases safety at sea. By connecting GPS, your exact position is automatically sent during distress calls, which can save lives.

Using GPS with AIS

AIS uses GPS to show the position of other vessels relative to your own, reducing the risk of collisions.

Using GPS with PC Applications

With the help of gateways like Actisense USG-2 or NGX-1, you can transfer NMEA data to PC applications such as OpenCPN or TimeZero.

GPS Data to Multiple Devices

To share GPS data with multiple devices, you can use NMEA buffers like PRO-NBF-1 or PRO-BUF-2, which is a cost-effective solution.

Summary

GPS is an indispensable tool for navigation and safety at sea. By integrating GPS with autopilot, VHF, AIS, and PC applications, you can make your system smarter and safer.

Tip: Always check compatibility with your equipment and test the installation before departure. For questions, contact the Manufacturer or a certified NMEA installer.