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Never mind!  All I had to do was update the software on my GPS! 

Hey guys!

First off, if there is already a similar topic then please direct me there so I won't waste anymore of your time!

The gear:  Garmin Dakota 20, MacBook Pro, and Garmin BaseCamp.

The Problem:  In trying to load a TN topo map (I'm not allowed to post an external link but it's called Tennessee Topo Map and was created by maps4gps), it's not showing up on my gps.  It shows the hydrology and roads but not the topo lines...and what's weird is that I tried installing it onto my aunt's GPS (which is also a Garmin Dakota 20) and it worked fine!  I've went through the settings on the two gps units and they are identical as far as I can tell.  I've also tried uninstalling the map and then reinstalling it but to no avail.  What could possibly be causing this and how can I fix it?  Thanks in advance for any help given!