We have two location trackers activated when we are on passage. When at anchor we sometimes deactivate one or both to conserve power.
Our Predictwind location tracker webpage can be viewed by clicking here. It receives our position through our Iridium satellite communicator. When we have access to cellular data we usually shutdown the Iridium and our position won't be updating. In that case....
Our Garmin Inreach location tracker webpage can be viewed by clicking here. This device consumes very little power and can run off it's own batteries for several days. So we usually leave it running all the time...unless it's cloudy for a week and our solar panels are having trouble keeping the house battery bank charged.
On passage we also leave our automatic identification system (AIS) running continuously. This signal is picked up by other boats within 10-15 miles and it is also received by satellites. This provides a 3rd location tracker. Our AIS position is updated on Marinetraffic.com whenever we arrive or leave a significant port - which isn't very often. Our Marinetraffic.com page can be viewed by clicking here.