Could someone tell me the difference between a Garmin microSD card and a Garmin datacard? (as in here:https://buy.garmin.com/shop/shop.do?pID=2091&pvID=3378). Was wanting the Southeast Inland Lakes card for a Garmin Vista HCx handheld GPS, but don't really know what the difference is in the two options.
Also, does anybody have this map card, and if so, does it show creeks and rivers (within a lake) with good quality and accuracy?

