Basic components
A receiving setup may combine an appropriate antenna, an SDR receiver, decoding software and an application to display the data. Compatibility depends on the components and configuration.
Reception quality
Antenna location, cable, interference and range affect received messages. Test the installation in different situations and do not infer coverage from a single test.
Receive only
An SDR configured as a receiver does not transmit your boat’s AIS position. Not all boats carry AIS and data may be incomplete; maintain a proper lookout.
The receiving chain
The antenna receives the signal, the SDR supplies samples to software and the decoder extracts messages for display. If no targets appear, check device, settings, decoded data and application connection separately.
Limits of a test
Coverage changes with antenna, cable, interference and location. Seeing a vessel in port does not guarantee reception offshore. A receiver does not transmit own position and not every vessel broadcasts AIS.