Made a screenshot of the ride and selected a spike.
I checked on the route where the spike was and it was in the dunes where the route is hilly. So the spike was probably uphill when I got out of the saddle.
The average power seems to be decent and the rest of the graph also
About re-calibrating. I wasn’t not sure if it was required or that is was just my lack of experience with outdoor PM’s. I just felt that power was low compared the effort I was making so I decided to calibrate again and see what happend. If I look at the graph it seems it didn’t made any significant difference. Altough I did it around the 32km point and the graph seems to have less drops to zero after that. Not sure if that was because I got out of the dunes and back to the flat road again.