Hi, I'm new to this and followed your steps and it works! (Thanks Xopher!) However I live in South Africa and purchased a nuvi 310 with the Southern Africa map on SD card.

When I go onto Mapsource it only gives me the 'rather plain mapsource map'. How do I go about getting the map from my nuvi onto Mapsource so that I can have more detail. Do I have to unlock the map and if so, where do I get the code from (I don't see one on the SD Card). Thanks to you and Tim for a brilliant site!

Would be great if there was a thread in reviews for the nuvi 310. Just curious what anyone who already had 2009 maps on a nuvi received, actual NT maps or just Waypoint and Trip Manager (Mapsource with basemaps)?

I instead bought Topo USA 2008 just to get some maps with Mapsource to plot points/tracks on my PC from my 750 (or old GPS 45 w/o maps), since I also do things out in the woods. Although, I recently bought an eTrex Legend HCx on Ebay bundled with City Navigator NT (2008), DC power cord, suction cup mount. After I registered at Garmin I was able to order 2009 map update no charge via 1st class mail. So I now have City Navigator NT 2008 on my PC and will have 2009 when updates arrive.

Did it and all i got was the basemap. Missing alot of roads in between the majors.

Re: unlocking any garmin map Mon Sep 29, 2014 1:23 am PGFT 2.2.5.4 has been released on and posted for the first time by marcoqc in my forum at that date. Primitive Technology - Cooking Big Cat fish by Girl At river - grilled fish Eating delicious 32 - Duration: 11:19. Primitive Life Style Recommended for you.

Am i missing something? Have the nuvi 850. I only had the base map. Very limited data set. Here's how I got around it and now have the map that came with my GPS in MapSource Your 850 should have a map installed. If you look on the Flash drive via USB, you should see a huge file ~ 1Gig in size. Mine was called gmapprom.img.

Copy it to the directory where the base map is located: c:/garmin/pcbsmp2/pc_basemap2.img. Rename the pc_basemap2.img to something else, like: pc_basemap2OLD.img. Finally, rename the map file from your GPS to pc_basemap2.img. Run MapSource and you should see all roads and points of interest etc. I only had the base map. Very limited data set.

Here's how I got around it and now have the map that came with my GPS in MapSource Your 850 should have a map installed. If you look on the Flash drive via USB, you should see a huge file ~ 1Gig in size. Mine was called gmapprom.img. Copy it to the directory where the base map is located: c:/garmin/pcbsmp2/pc_basemap2.img. Rename the pc_basemap2.img to something else, like: pc_basemap2OLD.img. Finally, rename the map file from your GPS to pc_basemap2.img. Run MapSource and you should see all roads and points of interest etc.

Sam I have a Nuvi 255. Followed instruction here, loaded map from gps to pc and changed name. But no detailed map. In my gps, there is also a gmapprom.sum file. In the mapsource, there is a pc_basemap2.tdb file (1KB).

I suspect I need to change my.sum file to.tdb? I only had the base map.

Very limited data set. Here's how I got around it and now have the map that came with my GPS in MapSource Your 850 should have a map installed. If you look on the Flash drive via USB, you should see a huge file ~ 1Gig in size. Mine was called gmapprom.img.

Copy it to the directory where the base map is located: c:/garmin/pcbsmp2/pc_basemap2.img. Rename the pc_basemap2.img to something else, like: pc_basemap2OLD.img. Finally, rename the map file from your GPS to pc_basemap2.img. Run MapSource and you should see all roads and points of interest etc.

I have a Nuvi 255. Followed instruction here, loaded map from gps to pc and changed name. But no detailed map. In my gps, there is also a gmapprom.sum file. In the mapsource, there is a pc_basemap2.tdb file (1KB).

I suspect I need to change my.sum file to.tdb? TIA TIA, I didn't have to change any other files, on the nuvi or in the c: garmin pcbsmp2 sub directory. Not sure what to tell you. Have you exited from MapSource and restarted it? I guess double check that the map from the nuvi made it to the pc correctly. And is named correctly. Anyone else have any thoughts?