C-MaP

[partgypsy]

I just moved to Chesapeake and thought it prudent to use a GPS. My old boat has a Standard Horizon plotter, but it appears that it needs a C-Map chip to operate. I have just spent two hours trying to figure out exactly what I need and am amazed at: a) how vague the info on these charts are and b) how expensive they seem to be.
I just bought the Navionics chart software for my Droid for less than $20. It appears the C-Map charts will cost several hundred.
What's so special about C-Map? Is there one chart to buy or do I need several?

[marc2012]

Ck on ebay,sometimes cheap,mostly too high.Try and get one for the area you will sail no more.Too large an area no detail.Your unit will probably take c map & c map nt but not max.marc

[clearsea]

I am surprised to hear this. CMap is one of the cheapest electronic chart solutions in our part of the world for a proprietary chartplotter.