The Garmin ECHOMAP Plus, like most Garmin instruments, comes with a standard power/data connection cable. Here's how to connect them to your phone, tablet or laptop over Wi-Fi, so you can use them with your favourite navigation apps.
With the Garmin kit there will be a power/data cable, that provides power to the instrument as well as NMEA0183 inputs and outputs. Note that Garmin deviates from the NMEA0183 standard by having a common wire for 0V power and also the B/-/ground of the NMEA output. Although this theoretically makes the NMEA connection more prone to interference, in practice it isn't an issue, though it makes the wiring slightly different.
Mount the Wi-Fi Gateway where it will give a good Wi-Fi signal to the users, typically around the cockpit or chart table. Or, for the logger, where you have ready acces to the USB port. Then connect to the power/data cable as shown in the table below. The easiest way to connect the Ground from the Garmin to both power and NMEA ports on our device is to connect their black wire to the 0V terminal on our device, and then connect short jumper wires on our device from 0V to the B connectors on the NMEA ports connected to the Garmin instrument.
To configure the NMEA0183 port in the Garmin, from the menu go to Settings → Communications. From there, go to Serial Port to set the port settings to match our device. The port should be set to NMEA0183. For the data logger, the data rate must be 4800bps; for the Wi-Fi Gateway it should match the Gateway setting (whose default is also 4800bps). Then go to NMEA0183 Setup to select the groups of NMEA sentences you want output, and their configuration options.
For the Gateway, if your app is sending data back to the instruments (e.g. route or autopilot data) then you will need to configure the app to connect using TCP, but if it is just receiving data then you are free to use either TCP or UDP.
NMEA sentences are sent and received by the ECHOMAP Plus system are as in the table below.