do not read this . Watch a video about how awesome this product be . you 'll learn too much about yourself with this watch . also . i feel this watch be better than the 400 series since it pick up gp signal so well -lrb- better than my gp navigator -rrb- . fun thing i have learn : I ski 43 mile in 4 hour of skiing . my heart rate peak about 10 minute into a run . my house be not that far from the garmin place .