Garmin GSD 24 sounder module (black box sonar interface), model GSD 24, S/N 294015380. Includes power cable with connector.
Ports:
POWER (red connector) — power cable included
NETWORK (Ethernet/marine network connector)
XDCR (blue transducer connector)

Used, tested and functioning. Power cable has been fitted with ring/spade terminal connectors on the wire ends for simplified installation (not factory original termination). GSD 24 unit and connectors otherwise stock.