Good morning all ,
I got new Edge 830 and I was trying to update the maps with garmin express and it shows me not enough space on the computer for this update .
I noticed the update is 23 GB and even to delete everything on the computer there will be no space enough again 
Also I deleted the preloaded map gmapdem.img incidentally .
Anyone to help ?
Can I find to download gmapdem.img somewhere ?
