Is there a better alternative to the pre-loaded European Recreation Map Coverage available for the Garmin 64st out there ?

Or, is there tips/tricks to "Improve" this map (add-on's, special files etc)?

I have already installed are "homecountry maps" of 1:20k, but I would like to improve / the resoultion /information of 1:100k (or 1:50K?) for Europe. The current pre-loaded map by Garmin is poor / useless (64st)