The GPSMAP 441 GPS Chartpltter may be a good choice for you if you are looking for something powerful that will fit in tight spaces. The ultra-bright 4″ QVGA color monitor makes it easy to see and the high speed digital map drawing and panning speeds make for a very smooth image that is easy to follow. Throw in the fact that the interface is very intuitive and eas to use and you have a competitive advantage.
It comes loaded with cartography of all US coastal areas, both continental and Hawaii/Alaska. It also has charts for the Bahamas. To expand your reach, the 441 is compatible with Bluechart cards which can provide 3d satellite views and auto guidance. As part of the package, the unit includes a high sensitivity GPS receiver that gives you quicker tracking and satellite acquisition to get you the information you need fast.
Your GPSMAP is also expandable with an optional GXMT 51 satellite receiver kit which can provide US Graphical weather data that you will need on the water. A Bluechart Vision G2 SD card will upgrade the unit with high resolution satellite maps and auto guidance technology which will automatically generate a route that is safest to follow avoiding shallow water, obstacles and buoys.