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Oh, boy...Sorry to be such a "newb", as my adolescent patients say...

Re-reading your post, I saw "Did you use MapInstall and select portions of 4 different maps, then send to the memory card?" DIFFERENT maps?  So I used the drop-down menu at the bottom of the MapInstall screen to select parts of the three maps I was trying to load, installed all of the selected parts, and Voila!

Thanks again,
Van

I'm sorry, I forgot to list the reason for all this.  I'm going to Yellowstone and Grand Teton for some hiking in September.  The MT Topo has a great map of Yellowstone, with trails.  But the map stops at the southern boundary.  So for Grand Teton, I need the Wyoming Topo.  But this one doesn't have any trails, so I think I would need an overlay, like from NW Trails or MyTrails? 

What do you mean "Change the filename"?  Change the name of GMAPSUPP.IMG?

Thanks again,
Van

Thank you for your help.  I appreciate you taking the time.

I'm running Windows 7 on an Acer.

Windows Explorer showed GMAPSUPP.IMG as being 9802KB.  The Garmin showed "MT Topo", one of the two topo maps I need,  plus "Colorado 24 Topo", which I think is a file I bought from Above The Timber, a map of Rocky Mtn National Park, North America (something) and a group of demos that came on the device.

I tried to load Wyoming Topo, which I had downloaded from gpsfiledepot, like this:

I used Base Map to load the maps from gpsfiledepot.  It showed my Micro SD  as Drive G: with two folders, User Data and City Navigator North.  I assumed the new files needed to go into User Data, to not overwrite City Navigator.  I right clicked on User Data.  One of the choices was  "Install Maps on Memory Card (G:). It loaded MapInstall.  <Continue> loaded WyTopo, the map I was working with.  It installed the map. 

Windows Explorer then showed GMAPSUPP.IMG as being 13,430KB.  and three Lower49_2013_20 files which I assume (?) are City Navigator files. 

Putting the Micro SD into the Garmin, the Garmin showed WyTopo, but NOT MT Topo.

I'll try to load one of the two Trails files for the area, NW Trails.  These are really small files, just the trails, no topo.  I assume they will act as overlays to the TOPO files?  They are already in BaseCamp.

Would it be easier to buy a second MicroSD for MT Topo?

I like the device, especially how rugged it is, but sometimes I think I'd do better investing in a power supply for my iPhone so that it would last longer than 2 hours in GPS mode. 

Thanks again, Van

I followed the very fine directions for loading gpsfiledepot maps into BaseCamp and from there onto a SIM drive.   Everything appeared to go well.  But when I put the SIM card into the Garmin Oregon, then went to Settings>Map>Select Map, none of the four new maps showed up.  The GMAPSUPP file shows activity at the right time, today, a few minutes ago.  I didn't write down the size of GMAPSUPP before and after, however.

Am I missing a step?  Why would maps installed to the SIM card not show up on Select Map?

Thanks,
Van

Rusty at using GPS File Depot.

I downloaded several maps of topo and trails around Yellowstone and Grand Teton.  One of them, possibly "MY TRAILS" consists of many icons and boxes with "TTN" and then three numbers. Clicking on the TTN### brings up a dropdown box with the position of the symbol.  Sometimes there is a name in the NOTES section of the dropdown. So clicking on TTN194  brings up dropdown box with position: N43° 44.079' W110° 44.485'.  Selecting NOTES brings up LUPINE MEADOWS TH.

What does TTN mean?

All of the symbols make the map cluttered.  All of the TTN### makes it more so.  Is there a way to reduce the clutter but keep the trails?

After just over a month, and only one week of outdoor use, my Garmin 450 died.  Would not power up when power button was pressed, although the computer-garmin screen would come up when I plugged the unit into the computer.  Called Garmin Monday. Support ran through some over-the-phone diagnostics, then issued a return authorization.  Mailed Tuesday.  On Thursday I received an email saying they had received it.  Also on Thursday I received an email saying they had shipped a new unit.  I received it today, Tuesday.  I registered it, called Garmin, got the account set up so that City Navigator could be moved from the old GPS to the new one.  I am happy.
   Has anyone else had an Oregon turn into a brick?