GPS watches make it easy to record your swims, but GPS in open water is notoriously unreliable – two watches on different swimmers will regularly give different data, even if they swam together. How then to best measure your swim distances? Especially when one considers that tides and currents can push you off course, or erratic sighting send you off on wild tangents.
GPS watches work best when out of the water – so each time you take a stroke with your watch on your wrist, the technology struggles. So how to get better data? Attaching your watch to the back of your goggle strap or under your hat can help, depending of course on your head position in the water. Or try strapping your watch to the top of your tow float if you swim with one.