The Upper Thames was the last time HK's Etrex 35 functioned at all. The Etrex 35 is less than a week outside the one year guarantee and HK is going into battle with Garmin for a replacement but I have lost interest in the whole affair. After five Garmins of various types, the majority of which have been unreliable or failed (other than the HCx), it looks like we'll be getting at least one Wahoo Elemnt (not Bolt).