Contact automatic report: Every so many minutes (defined by this
parameter) there can be an automatic contact update on the navigation map,
often accompanied by a radio message (or log notification). The frequency at
which such messages are broadcast is governed by this parameter. Every time
the number of minutes specified has elapsed, then there is a percentage chance
of a contact update. The default is -1, which means not to report at all.
Probability: This is related to the previous point. It is the chance of a contact
being reported. (default is 100% )