Hugo,
You put the card in and then you go into the charts menu to select the Navionics or the Lowrance basemap. So far, I've only played with it a little, but the Navionics Gold charts seem to be comparable to the Garmin Bluechart I'm used to.
The Navionics Gold definitely has more coastal detail than the Lowrance basemap. IMO, it's worth the money,especially if you'll be in Biscayne Bay or the Keys. Ironically, to see the Suwannee River, where I've been running the boat to break in the engine, I have to go back to the basemap.
The only downside to Navionics I'm aware of is that they don't have a good software package for managing routes, tracks, and waypoints on your computer. Most of the reviews I've read on NavPlanner2 are discouraging. I guess Garmin's Bluechart has me spoiled. I'm going to play with GPSBabel to see if I can convert data from Bluechart to work in my Lowrance unit.
Dave
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Blue Heron Boat Works
Reinventing the wheel, one spoke at a time.
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