OUDIE
Yes, without connection it is only able to work from gps altitude and the gps chip is not accurate when circling tightly. Ideally it should be connected to an external gps source as well as a smart vario to get both vario and position data more accurately. I found it useless without external data. In the old days of Winpilot the thermal maximiser was only available in the pro version which required smart vario data.
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