Clif, we have the RVND 5510, which was the first RV GPS from Rand McNally.
The instructions say there are multiple ways to download the POIs. What I did first was download POIs for 14' and lower.
It also said you could download ALL low clearances as a .zip file, So I thought why not?
Within the GPS, once the files are uploaded, there is a place to indicate the icon these show on the map and how soon you want to be alerted to them, but they must be already programmed to be avoided.
In the "My POIs" area, I designated the icon as a red square for anything in the "All low clearances" database, and a skull&crossbones for the "14' and under" database.
My height set in the GPS for my RV was 12'9" (actually incorrect, we are 13'+ now!) when we discovered the GPS was avoiding a 14' 3" bridge. So honestly, I'm not sure what's going on with how the database of POIs interacts with the actual navigation on this Rand McNally. I just looked again at every menu and there is no place to specify what kind of action to take when encountering a custom POI.
My recommendation is to only upload those low clearances you wish to avoid entirely.
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Oh and this wasn't the only crazy bat cr*p this GPS has pulled, so it almost got tossed out the window.
On our way home from Thackerville, OK to Cisco, TX that GPS wanted us to turn due south, even on some questionable county roads, every chance it got. We finally just muted it since we knew the way.