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I uninstalled from the Windows App menu.  I figured this was required because something had to be in the registry.  BaseCamp somehow knew the default directories for all these maps.

Hummm....   MapSource said it xfered the maps to my GPS and I see three .img files in the Garmin subdirectory on the SD card in my 66st.  But after I uninstalled the the three maps I downloaded from my computer I can no longer see them when I plug my GPS into my computer from BaseCamp.  I would think they would still show up in BaseCamp from my User Data folder just like all my waypoints and other stuff that is in my GPS. 

When my GPS is unplugged from my computer I can still see the maps from my GPS.

[use the default install location]

Boyd your magic comment was "use the default install location"!  :-) As long as I didn't change the default directory of the maps I downloaded they all showed up in BaseCamp (and MapSource) and I had no problem sending them to my the 66st microSD card.  Go figure!  With File explorer I see the 3 maps on the SD card in the GPS.

I guess once the maps are installed in my GPS I can go delete the map folders that are scattered around my computer. Would be nice if changing the default directory actually worked since the let you do it in the install process.  :-)

Thanks for all your help!

Hi Boyd, from your reply and the number of view of my message I'm super happy to see this site is very active, thanks!

As far as your questions, I've attempted to install maps on both the 'Internal Storage' and 'User Data' under Devices | GPSMAP 66ST in BaseCamp.  I did this by right clicking on the specific folder and selecting 'Install Maps on GPSMAP 66ST'.  This then brings up MapInstall showing my GPSMAP 66ST with the message 'No unlocked maps were found for this device.'

My card is 16GB that I've formated in Windoze 10.  It shows up in Windows explorer as 'GPSMAP 66ST (F:)' while my 66ST shows up as 'Garmin GPSMAP 66ST (E:)'. Both drives also show up in BaseCamp under Devices.  Only thing on the card is an Id.txt file and a Garmin directory with a SQL sub-folder.

The Map Setup | Configure Maps screen on the 66ST only shows two maps, Worldwide DEM Basemap NR and Topo US & Canada v2.00.

I don't see any maps on my computer in BaseCamp or MapSource. I think my problem is in installing maps on my laptop computer where MapSource or BaseCamp can find and recognize them.  I've install a Michigan topo map to my laptop.  With MapSource I go to the location D:\Garmini\mitopo11 which lists a 1227A.TYP and a bunch of *.img files and it doesn't want to open any of them.

I've followed some of the tutorials but am having a hard time loading a map into my 66st.  I'm running Basecamp (v 4.2.5) and MapSource (v 6.16.3).

Just looking to install some Michigan maps of IR.

Thnx,
-TAC