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Hi
Oregon 550; sorry I didn't make that clear.
I did finally get things to work.  I didn't carefully read the directions on the map page that instruct me to double click the .gmapi file.  Once I did that, it seems to have worked fine.

I loaded 2 different sets of maps.  It looks like it put them all on the microSD card in a "Garmin"folder and it shows as ONE gmapsupp.img.  When I turn on the unit, however, it shows both sets of maps as enabled.  Does the Garmin combine all the imported files into one gmapsupp.img?

Thanks for responding and offering to help.

I just bought a Garmin 550 and am trying to load maps obtained here on gpsfiledepot.  I installed  Garmin MapInstall on my Mac and updated the latest software onto the GPS unit from Garmin WebUpdater.  I installed a 4 GB Micro SD card.  When I connect the USB cable to the GPS it says that the cable is detected. WOuld you like to go to mass storage?  (I assume that I do)  Do I want to have the spanner mode selected in the setup or do I have to do something else there?
When I try to open MapInstall, it says that no Garmin Maps are found and that "we could not locate any Garmin map products to install.  Please make sure you have a Garmin Map Product installed and run this app again."
What am I doing wrong?
Thanks