As usual, it pays to do ones due diligence before purchasing components; and the Spot Messenger is no exception.
The Spot Messenger will provide a means of locating the HAB while it is below 6500 metres. This will allow us to locate the payload…which would be close to impossible with the GPS because LOS issues might stop us from getting radio reception when it is closing in on the surface of Earth. There is however a potential problem with the GEN3 version of Spot Messenger. It has a feature to power down the Spot Messenger if there has been no activity for 1hr. With a flight duration of 2 hours, it is possible that the Spot Messenger might turn off before it is retrieved! Certainly not ideal. So I am considering purchasing the previous version of the Spot Messenger.