Why not try?!? You will not break the device!
Garmin often have variant readings with the reality on official site. It is a usual NT map, and Garmin etrex legend HCx is reading it. May be you lose a some functionality on map but your device lose to it on all modern map. Moreover I see in list the GPSMAP 60/76Cx that have the same navigation engine...
The "install maps on eTrex Legend" option is greyed out in basecamp. Pic here:
I'm using the imdisk virtual disk driver from this thread:[Only registered and activated users can see links. ] to open the map in Basecamp.
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