Update I think this worked!! I haven’t tried it in the field yet, just in the office tests. Using RPi Zero 2W with a USB splitter (must be high data transfer, cheap one didn’t work) the Nooelec dongle and USB GPS - but NO modem. This system is half the price of the first version and uses about half the power! It’s running at under 3W (the first was over 4W). Using the USB power from the Power Kit mentioned above, I can get 30hrs running with NO solar input. I think in a good solar exposure situation, this could run indefinitely. Obviously, I still need to test it in those field situations - solar is not always as good as we want it to be. Yes!