Garmin Edge 800

I'm tearing my hair out trying to get OSM onto my 800.

Bought micro SD card and reader, downloaded velomaps Great Britain. Followed instruction on Ride with GPS

Installing Free Open Street Map data

Some people purchased an Edge 800 for cheap because it didn't come with Garmin's City Navigator maps installed. This is fine, because there is a complete and comprehensive set of free maps (wikipedia style user-generated maps) from the Open Street Maps project. You can install these maps on a microsd card, and then use your Edge 800 like normal. Better instructions will follow, but here is the gist.

• *Choose a mapset from this link* - Since I am in North America, I use either *Mantlik's contoured maps or *Dave's
  
• *You have to enable data recording on the SD card by changing the settings: Settings > Data Recording > Record to memory card. *
  
• Place a blank SD card in your Garmin, turn it on and then start the timer. This will create the proper directories on the SD card automatically. <
  
• *Stop the brief activity you just started. Feel free to revert the "Record to memory card" setting once you have started then stopped the timer. *
  
• *Plug your Garmin into your computer. Depending on your computer, you will probably be prompted to open a folder to view the files on both the main unit and the SD card. Otherwise, navigate to the drive/folder your computer assigned to your SD card. *
  
• *After downloading, copy the IMG file to the SD cards "GARMIN" folder that was created earlier. The SD card can have multiple IMG files on it and you can choose between them in the Edge 800 configuration menu. I kept my names descriptive, "osm_western_us.img". VERY IMPORTANT: keep the name short and free of spaces or odd punctuation - underscores are OK for spaces. *
  
• *Once the file is copied, safely remove (right click on the icon in the lower right of screen for Windows users) the SD card from your computer. *
  
• Insert the card and power up the Garmin. Go to the configuration menu, then System -> Map -> Map Information, and select the map type.
  
• Enjoy!
  No chance - no sign of the maps on the unit.
  
  

Any ideas?