[doublepost=1492135267][/doublepost]I've had my Apple Watch 2 weeks and the map worked for the first week. Since then I only get the grid. I've unpaired, repaired, rebooted and only the grid appears. Actually getting tired of Apple's crappy products, inferior packaging and lack of service and responsesI had this once and had to unpair and re-pair the watch to fix it, which was a bit of a pain because it takes a while.
However, if you haven't already, then it is worth rebooting both the watch and the phone first, in case that fixes it for you.