The forum article http://forum.virtualradarserver.co.u....php?f=1&t=353 states very clearly this behaviour:
Liviu
The receiver range is reset whenever you start VRS, or when you change server options that affect the plot (e.g. you change the receiver location), or when you use one of the menu options on the server to reset the receiver range plot. It is not stored anywhere, so you need to wait a while before it can give you a reasonable idea of your receiver's range.
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