How do you delete an existing map (COtopo11) from the Garmin 600? Thanks
Connect the GPS to your computer and view files/folders. Look inside the \Garmin folder. Do you see a file named COtopo11.img? If so, delete it. If your GPS has a memory card, the file might be on the card instead of internal memory.
If you don't see a file named COtopo11, then what files are there? What other maps have you installed? And what is a Garmin 600? Oregon 600? Montana 600?