In some places, you may find locked files, but there are tools to unlock those.
An additional option (but not free) is to purchase official maps from Garmin’s website.
The cost in the UK (Europe map) is £49.99 for a single update or £74.99 for Life Time update (updates forever).
If your GPS has LMT in the description is because Life Time updates are included already (no extra charge).
Once connected to your computer, it will appear as an additional drive, as shown in the image below.
is the base map containing only large roads and larger cities, not really suitable for routing.
You could delete it but as it is only about 50 MB you wouldn’t gain much space.
You can also delete some of the voice files to make room.
These probably contain lots of different voices and languages (files with . Another option would be to go to garmin.and select only the files you are interested in and see if the generated map fits on your device.