My Garmin RV760 properly mapped the location to an RV park in Ventura, CA but then failed to tell us how to actually drive to it. So it was marked nicely on the map, but never told us what offramp to take so we waved as we drove by on the 101 northbound and took the next exit 2 miles away to double back! Complete (and mysterious) FAIL!
I am occasionally annoyed when it insists that I "make a legal U-turn" at times as well...
Yes, I am using the RV mode with my trailer data properly input too, so it should know that making a U-Turn is usually not an option with a 36' 5th wheel in tow.