I am thinking about purchasing a GPS. If you had up to $900 to spend on a Chartplotting GPS what would you buy? What features do you like the most? What problems are there with the unit? What are its limitations? Where would you mount it? Here is some background on my boat and my sailing. I have a 1990 Catalina 30. It is used for coastal cruising in the Potomac River and Chesapeake Bay area. I do a lot of weekend trips (around 2 a month for 3 days) and I take at least one extended vacation a summer (around 10-14 days). My boat is equipped with a Raymarine S1 wheel pilot. I currently own a Garmin GPS Map 76S (I really like my Garmin). The GPS will actually be a gift from a family member to me (long story). Any comments or suggestions are appreciated.