Map background is black instead of white

I’ve seen the black background on my watch too. I assumed it was night mode as it seems to have a white background during the day and black at night. 

I've seen this too, but during the day.  I restarted the watch, and it seems to be ok now.  I suspect that sunset/sunrise time got screwed up.  

That would make sense, don’t understand where that data comes from though. The stock watch faces do seem to have the right data for sunrise/set, and regardless of time of day the maps still have a black background. 

I’ve tried a soft reset, really want to avoid a hard reset...

1. You don‘t have to make a soft reset. Just make sure, you got a actual gps fix by starting an activity or sync time with gps

I have this issue as well.  No theme selected, but the map background is dark grey (not black).  This is not affected by time of day, it is always grey.  I have to switch the map theme to high contract to get the white background back.  Very annoying.

The time on my watch is correct and I use GPS for the runs themselves (and map navigation) so not sure that’s the issue...

Mine too had GPS fix.  However, it was a day or two after I flew from Hong Kong to Ireland.  Its possible that sunset/sunrise time got stuck on HK time.

• I did check what the watch thinks sunrise/set time is (both from widget and stock watch screen) and it looks to be correct. Also, whatever time of day I’ve tried it always looks the same. So maybe it’s not to do with the watch thinking it’s nighttime (that should probably be configurable anyway if that’s actually a feature). 

Had the same. I think to get the white background, you have to select 'high contrast' in the map settings.