Great idea! I just found these on a search:

http://www.firstchoicemarine.com/c-118-glove-boxes.aspx

http://cgi.ebay.com/ebaymotors/LOCKI...QQcmdZViewItem

http://www.iboats.com/Boat_Glove_Box...view_id.257650

http://www.amazon.com/dp/B00144D6BG?...0&linkCode=asn