Any idea what this is for?

[OZDreamer]

I discovered a knob under the dash, just to the right of the steering wheel (from driver’s perspective). The wires disappear into a conduit and loom so it’s difficult to follow them. Any ideas what it might be for?
Boat is a 2003 216 Sport SE DD.

[2004196]

Looks like a rheostat - something to do with the stereo? - perhaps volume balance between different sets of speakers like front/rear or boat/tower?

[youngunz]

I came across the same knob on my '02 SAN while I was winterizing the boat. Unfortunately the batteries were taken out so I wasn't able to test it.

[AirTool]

It looks like the gain control for the secret microphone that relays all of your conversations back to CC headquarters.

I think the newer models have secret cams that transmit video of the topless ballast in addition to the legacy audio.

[Calgary210]

I think that might be for adjusting the speedometer needle while using zero off, found mine under the cup holder driver side.

[xlair]

Pretty sure that is for adjusting the speedo

[ski4evr]

Yep, that is for calibrating the spedo. Works well when on flat water with a gps handy.

[SkiTower]

It looks like the gain control for the secret microphone that relays all of your conversations back to CC headquarters.

I think the newer models have secret cams that transmit video of the topless ballast in addition to the legacy audio.

Somebody's got too much time on their hands

[AirTool]

Somebody's got too much time on their hands

I couldn't resist.