Four GNSS antennas drive heading accuracy
The SCX20 uses four separate GNSS antennas, allowing the unit to calculate heading from several possible baselines rather than relying on one antenna pair. Furuno says this architecture helps maintain heading information when parts of the sky are temporarily obstructed.
For leisure boats, dependable heading data can improve the behaviour of radar, autopilot and sonar systems. A satellite compass also avoids the magnetic interference issues that can affect conventional heading sensors installed near wiring, speakers or metal structures.
NMEA 2000 makes the data available around the boat
The SCX20 is NMEA 2000 certified and distributes navigation data over a standard backbone. That lets compatible chartplotters, instruments and autopilots use the same heading, position and motion information without separate sensors for every display.
Furuno lists support for GPS, GLONASS, Galileo, QZSS and SBAS reception. The unit can also provide barometric pressure and air-temperature data, adding useful environmental information to a connected onboard network.
Motion data can stabilise radar and sonar displays
Pitch, roll and heave information can be used by compatible Furuno sounders and sonars to improve presentation when the boat is moving in a seaway. Accurate heading can also help radar echo trails remain steadier and easier to interpret.
These benefits depend on correct installation and configuration. The sensor needs a suitable mounting position with a clear view of the sky, and owners should confirm that the devices they expect to use actually support the relevant NMEA 2000 data.
Compact format suits many leisure craft
The dome-format SCX20 runs from 12 or 24 volts and is designed to be mounted on a roof, pole or other suitable structure. Its compact footprint makes it relevant to cruising, fishing and fast leisure boats where space around the helm and hardtop is limited.
An upgrade should still be planned as a complete system rather than as a stand-alone purchase. Network capacity, cable routing, mounting rigidity and integration with the boat's existing radar, autopilot and displays should all be checked before installation.
Official sources: www.nmea.org; www.furunousa.com.