Help with understand the features of a handheld GPS?

I have a bit more pricey model the garmin gpsmap 60cx, its a few seasons old now but it is doing fantastic. I use it hiking, fishing, hunting and geocacheing. You should be able to go "online" and examine the working features of your new unit, Magellan is pretty good at backing up their products. Some of the same features that are used in geocacheing are the same for "way point" marking and it should also have tracking features. What I am not sure is if you have a preloaded map, if it doesn't trade it in for one that does since that is the most important feature of a GPS system.