


Strange GPS data and missing route segment
I went for a run this morning with my Garmin Instinct 2 Solar. At the end I found two very strange things happened with the GPS data.
The first was a segment that had a 1km lap time of 3:42. I was running at about 5:20 to 5:30/km pace so this is definitely wrong. I think it corresponds to the zoomed in section of the route map which has a bunch of squiggly lines. This was in a section where there are several tall buildings.
The second is that the first four kilometres are completely missing from the route. I have marked the missing segment in yellow on the map. My watch was recording the distance and pace during this time. The lap data and final distance still includes the segment that is missing from the map.
I guess the first problem was caused by poor GPS signal in an area with tall buildings. I cannot understand why the first four kilometres of the route are missing though.