GPS Unit

[chumbucket]

All Garmin units come with a world basemap and can be used immediately as is. The Bluechart software that adds more defined cartography is an optional CD that you purchase at any time and downloads from your PC. Garmin gives you an unlock code when you purchase the CD that will allow you to load charts of a given area of useage. The cables supplied also include an AC adapter plugin that also has the PC cable on it. I would recommend the Bluechart CD software as they have much greater resolution and charting info over the Mapsource CD's. Bluecharts are raster scans of actual NOAA Charts that also include navigational aids and water depths, hazards, etc.