The Prop NET Project ... propagation tracking! The charts
on this web site reveal what RF communication circuits
are available (and NOT available), in real time and
without the inaccuracy of human assessment.
... providing station performance assessment
to others! Operators who can't seem to get a response to
their "CQ's" can "ping" a PropNET
station (by sending a PropNET formatted transmission) and
see if they are reported by a PropNET participant (along
with an IMD report) on www.PropNET.org.