Terrain Follow Without Data Connection?

DroneDeply support rep could not give me a yes/no answer on this. Does terrain follow work if the app is running on a device with no cellular data connection? If it does, can the flight plan be slightly altered (say expand the boundary 100 feet) and still retain terrain follow. I would think if it works with no data connection, it would be best to just design alternate flight plans beforehand would be the safest approach.

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TA is only available on iOS and requires a data connection.