I've checked that only one map is listed.

The unit used to behave correctly, and seems to have developed this over time, but may have been introduced over a map update. I moved last year, and the street that the house is on wasn't on the old maps, so I started looking around to update the maps. I followed [Only registered and activated users can see links. ] to update the internal maps and it seemed to work just fine. I don't normally use the nav very often around town, only on trips, or heading to somewhere new. So it's possible that the last map update (2015.40 NA) introduced the problem, but I can't say for sure. The maps work fine in the garage, the problem seems to be when moving.

I'm afraid I don't know how to revert the maps back to what it shipped with to test that. The updates were all one way.