The Garmin GPS 12 is a good, reliable unit for $145. The 12XL has more memory that you'll never use, so save your $ and just get the 12.<br><br>The 76Map looks OK, but it is a lot more like $350 (?). Given that you'll be going fast and that the screen will be hard to read inside of a waterproof bag covered with condensation (inside), water drops (outside), and sun glare, you have to ask if the extra $$ was really worth it.<br><br>I'd start off with a simple Garmin 12, get used to it (there already way more features than you'll use), and then consider if you really want/need a mapping unit after you've lived with it for a year. By then the will be cheaper, and if you destroy the 1st one you are out less money.<br><br>BTW, none of them (any mfg, any model) are waterproof by catamaran standards. While a warrenty may replace a failed unit, if you really want it to work when you need it, you need to keep it in a waterproof bag ($20).<br><br>Sail fast and have fun,<br>Alan Thompson<br>I20 - San Diego<br><br><br>