The Tracking Key Pro is a passive and compact unit that simply collects Latitude and Longitude data every second from GPS satellites. It stores the information internally and can be connected to a computer via USB connection to retrieve the data. According to the specifications sheet, not only can the device can run up to 80 hours on a single charge, but it can be wired to a larger battery source so that it can run indefinitely.
The plan is to acquire 2 of these units. One will always stay with the boat, and the other will go with us whenever we leave the boat. Having 2 will also provide a certain amount of redundancy.