The RANGE Property is used to tell PAMGuard which of the Controls contains range information (about a sighting, etc.)
Topic
The title of one of the other controls, which contains numeric data giving a range.
PostTitle
Must be one of the following:
Topic - set to FIXED to display data at a fixed range (i.e. if you have bearing data but no range data)
Length - Used to specify the range if Topic has been set to FIXED