I am working on a project for a marketing class and wanted to get some feedback. I have to develop an idea for a new product. I am novice certified open water diver. I think a GPS unit that allows divers to find locations and mark them.

What do you think about a housing for an existing hand held GPS? I am thinking of a plate that attaches to the GPS and a water tight cover to go over it. This cover would be a one time use only after the seal is broken.

For my project please respond to the following questions:
Is this a product you would buy?
Is this a product you would use?
How much would you pay for this product?

Thank you for any help you can provide. I am also open to comments that might help improve this idea.