You might have noticed some GPS drift on your activities in the last few weeks, or even a run that was way off course. It happened to me a few times, as you can see below.

The walk above wasn’t too far off course, but a couple of other activities were far more wrong. This has occurred with fairly new watches from Garmin, Suunto and Polar, and is all to do with the GPS chip made by Sony.

Every few days a file is sent to the various Apps, which is then sent to your watch. This file contains details of where the satellites will be over the next few days, allowing your watch to find GPS reception much quicker. Quite clever when you think about it.

However, this file has been wrong a couple of times, hence why there has been GPS drift. Garmin have assured everyone that the…