Changes

* The 620 has remarkably good repeatabilitydoes surprisingly well going under the bridge, which is a measure of how likely it is to give the same indicated distance on a particular part of the course. This can create an illusion of greater accuracy than is actually there, and indication that it also suggests that the TomTom is smoothing out curves too muchnot having excessive problems with reacquisition. * On the out-and-back turnaround the TomTom 620 does a little worse better than I'd expect for its overall rating, again suggesting too much smoothing. * Running in a straight line on the other hand, is a fairly easy task for most GPS watches, and the TomTom really excels620 does well, giving the most accurate reading of any device. * The TomTom does about how you'd expect going under the bridgebeating many watches that have higher overall accuracy. * I not had any issues with the TomTom 620 acquiring or maintaining the GPS signal, unlike some other devices.

|[[File:BridgeGarmin 620 (3.30).jpg|none|thumb|x300px| You can see the 620 does a reasonable job most of the time. There are a number of tracks where it gets a little lost, and there are some very minor issues with the 620 reacquiring the signal after the bridge. It does poorly around the twisty section, cutting the corners too much due to smoothing. Interestingly, it does a better with the sharp turn seen on the right side of the diagram. The lap markers in blue are more widely dispersed than they would be with a better device. (This diagram has tracks color coded with green indicating good accuracy through to read indicating poor accuracy, and the lap markers as blue dots.)]]