I do not understand all these user's wanting to format their Garmin GPS Units.
I have 10 different Garmin Units and have never had a need to format any of them.
Some are as old a 2007 and still work 100%.
I never do anything to the SD card while it is in the unit..
You remove it for what ever reason you need to.
You format it or remove a map or put a new map on it.
Then put it back into the GPS UNIT.
There is no reason to do anything thing to the internal memory of the unit.
You connect with Garmin Express and do all your updates with that PC software.
I have different SD cards for what ever country I will visit along with and POI's or GPX files on that SD card.
I remove it and put the next country I will be going to in the GPS UNIT.
Any maps POI's or GPX files are add while I have the SD card attached to the PC.
Then use MapSource or Bascamp to transfer any Gamin maps.
If I have Openstreet maps I copy them direct to the SD card with out the need of MapSource or BaseCame software.
Then I put the SD card back into the GPS Unit I am going to use.
READ THIS:
Garmin Edge 1000 Factory Reset
To perform a master reset:
Power device off
Press and hold Lap and Start/Stop
Power device on while still holding both buttons
Continue holding buttons when Garmin "splash" screen appears
Release buttons when Garmin "splash" screen disappears
The reset is successful if, once powered up, the device proceeds into the initial setup wizard. Once the reset and setup wizard are complete, place the device outside with a clear view of the sky for a minimum of 20 minutes to acquire satellite data.
1A User Data Clear (prompted) can be performed in order to remove user-entered information without removing history.
To perform a prompted User Data Clear on the Edge 510, 810, Touring or Touring Plus:
Power device off
Touch and hold finger in top-left corner of display
Power device on while still maintaining pressure on display
Release display when Reset all user settings? message appears
Touch Yes (check mark)
To perform a prompted User Data Clear on the Edge 1000:
Power device on
Touch Setup menu (tools icon)
Select System
Scroll down to select Device Reset
Select Factory Reset
Select check mark (right) when prompted to Reset all user settings?
Clearing the user data will restore all of the device settings to the factory default values.
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