I've got a Hobie Adventure (no Island) that I use mostly for fishing, mostly in saltwater. I've had the boat since last July and use it regularly (average more than 2x per week in summer here in California, and about 1x per 2 weeks in winter). My typical day on the water is about 5 hours, with almost constant pedaling, usually at a fairly slow cadence (I like to troll).
I often get a squeaking noise when pedaling. It's most common when starting out, and it usually goes away after a while, for no apparent reason. However, on rare occasion, it will start out quiet, then the squeak begins. Here's a brief video that I shot using a GoPro with the waterproof case on (so it was actually a lot louder than it sounds here):http://www.youtube.com/watch?v=G4BNzZIoFMw
I always rinse the fins after use, and I regularly lubricate the mechanism, using silicone spray as recommended by Hobie. It sounds to me like it's plastic rubbing on plastic, and it doesn't seem to do any harm. But it drives me batty when I'm out fishing and there is complete silence except for that steady squeak, squeak, squeak, ...
Any advice or suggestions would be appreciated. Thanks.