Itís hard to tell from the pictures. My first guess, based on the long plug
centered at the back, would be a dock
for the old pre-lightning plug
iPhones/iPads. Itís close to the Fusion controller, which is an audio system. Maybe the Fusion system was replaced by the car stereo at right and they didnít want to fill the old holes. IIRC, Simrad
once had some kind of deal with Fusion.
Second guess would be some kind of Simrad dock
for a remote
controller of some kind.