2001 Seadoo Islandia >> Power port for?

[NavyEagle]

I just purchased a used 2001 Seadoo Islandia and have this power port that I can't find out what it is used for. Could it be a battery charger?

Does anyone know?

I posted a link to the pic as I an not sure of the size limits on the site.

http://www.midnighteagle.com/power port.jpg

TIA for any info.