If it was absolutely necessary to blame him something that would be of limited battery life especially in rainy weather (I think she is discharged through the contacts on the wrist and also focus triathletes, but is possible with a DIY the bike mount) and what is not a defect, its inability to indicate a direction when it is not moving because this is not a compass but a GPS (+ heart rate monitor)
But really, that's nitpicking.
The fact of finding his path on Google Earth by simply connecting the software is very playful. The fact of finding its way night after getting lost is not bad either ...
A very good buy, not expensive for what it can do.
