OpenStreetMap is a global wiki map (think "Wikipedia for maps"). The wiki nerds have produced Garmin-compatible extracts that are available for free. Here's how to enjoy fresh free wiki maps on your GPS.
You will need:
- An expandable Garmin GPS (one with 'x' in its name or a fancy-pants new model like the ForeRunners or Colorado).
- A micro-SD memory card.
- Either a USB connector and Garmin driver software, or a card reader.
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Signing UpStep 1: Get Maps!
Map company Cloudmade do the whole world. Go to http://downloads.cloudmade.com/ and browse for the region you're interested in. Let's say we're flying to Barbados on holiday: http://downloads.cloudmade.com/north_america/barbados - download the IMG file and unzip it.
The OpenStreetMap project has their own download page here: http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin. There are lots to choose from including different regions, levels of detail, and styling. Fill your boots, it's all free.
My own Garmin map, which is a routable UK & Eire with extra contour lines (thanks NASA!) updated weekly, is here: http://ravenfamily.org/andyg/maps.
When you've downloaded your map, you should have one file with a .IMG extension.





































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I have downloaded the UK map file, I have put it on my nuvi40 - in the 'GARMIN' folder - file called 'GMAPSUPP.IMG'. I can find no other file on the nuvi40 that resembles a map file in size or name, so I have not been able to remove what's loaded (spain and portugal). I've restarted the nuvi40 and it doesn't seem to see the new file, nor does it appear to have any kind of relevant interface to choose the map file I want.
Any advice on what to try next?
ahmadreza.rivandi@gmail.com
How do you load more than one map at a time? Do I merge the foiles or something? I want to put New Mexico and Colorado topo maps on my GPS. Thanks in advance!
I ended up using the site www.gpsfiledepot.com
They have very detailed maps that have their own executables also. I used BaseCamp to put them over.
Thanx in advance....
Get hold of the Groundtruth app from the Openstreetmap community to build your own: http://wiki.openstreetmap.org/wiki/GroundTruth