Quote Originally Posted by EuroDriver View Post
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[EDIT: I tried again this morning with the .unl file but withut the .gma file and it does not allow me to load the map - it keeps requiring both files to proceed]
This is interesting seeing that the files belong to an earlier map version. Normally it is a 'no no' to have such files present with a different map 'cos it can cause problems, not prevent them.

Perhaps this non-Garmin unit just needs to see such file types present regardless of their content during the loading process. If the map being loaded is locked and the files don't match it's FID or the Unit ID then no doubt the unit would display some message like 'Can't unlock/authenticate Maps' on boot-up.