listing / deleting duplicates

In general I like the basecamp / 64s, but I have a slight problem.  I record data and mark points, then at home I label the points.  The problem is I end up with 2 points at same location with different names.  Is there a way to search or sort by coordinates or for duplication? I have other software that does this and it doesn't seem like it would be real hard. Like where you have the option to sort by symbol or name, add Lat and/or Long.