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First off, on the forum, I spotted a very brief reference to Ibycus maps.  Internet searching lead me to comments from posters that was a great new topo map, and the author had been working on a USA topo map.  I spent more than an hour downloading it, and installing it, finding the massive 3Gig ZIP file created a larger topo map for Canada.  Oops.  Canada wasn't what I wanted. 

I then used Garmin's MAPSOURCE.EXE and the already installed California Topo files (in the same C:\Garmin subdirectory) to re-select SF Bay Area sectors, and I this time installed it NOT DIRECTLY ON THE NUVI 750 but instead on my Sandisk 4Gig HDCD mini-disk, which was already inserted in the Nuvi (which happened to by drive J: on my computer), using my USB cable connection.  This time, when I fired up my GPS, I selected ALL the maps, and the Topo lines appeared right along with my normal Street names and other features. 

Thanks! :D
Hmmm - thanks.  I fired up MapSource.exe and re-selected SF Bay Area Counties, all of which had numbers (not names), turning all those boxes pink - as the directions indicted.  I turned off "autoname" and called the package "Bay Area Topo", and downloaded it to my Nuvi 750.  Well, the old downloaded string of numbered parcels disappeared.  Now I have 3 choices - the first two are identical:  

1. California Topo [1] Bay Area Topo
2. California Topo [1] Bay Area Topo
3. City Navigator North America NT 2009

I'm at the same point: If I check all three maps, I get the "standard street map" - no topo.
If I only check one Topo - I get minimal (only highway) roads - no topo data.  
If I check both Topos - I get more roads - but no topographics.

Hmm - all of this is going into my Nuvi 750, (I don't know where) as my SanDisk 4Gig SDHC card has no files on it at all.     Idea:  There has to be some way to "erase" what I've put on the Nuvi 750 - how do I do that?  Then maybe I can insist on MapSource.exe install my stuff on the SanDisk 4 Gig card.  Maybe that would work.  ????

GPSr Units / Nuvi 750 can't display California Topo Map
January 11, 2009, 01:48:29 PM
I have a NUVI 750, and would like to use it hiking in the SF Bay Area, so I very carefully followed the instructions on and also to download the California Topo map, and then using my USB connection, installed Bay Area selected maps on my Garmin Nuvi. 

Well, using TOOLS / SETTINGS / MAP / MAP INFO I can see TWO identical entries listed as "California TOPO' with the grid numbers I selected, in addtion to Garmin's "City Navigator North America NT 2009"  However, no matter what I select or fail to select, I cannot see anything that looks like a topo map.  If I select all of them, or the Garmin map, I get my normal "street" map view.  If I select only one of the Topo maps, I don't get any topo info, I simly get a stripped -down (no details) mostly blank view of my area, just showing Highway 101 and some nearby towns, and the Bay, .... no details of any sort.  I've installed a 4Gig SanDisk SDHC card, but on checking the card - there are no files on it.  What am I doing wrong?  Thanks!