Examples:
jo32kf 3 - draw 3 ms circle around QTH height 400 - set ionosphere height to 400 km (default 300 km) for next lines
jo32kf 3e - draw 3 ms circle via E-layer at 100 km use height 0 for ground-wave
jo32kf 3g - draw 3 ms circle via groundwave rtw 139 - set round-the-world time to 139 ms (default 138.5 ms) for next lines
pa3fwm 3 blue - do so in blue; may use some pre-programmed location name (used for multi-hop propagation)
jo32kf hops - draw boundaries of regions reachable by 1, 2, ... hops precision 0.1 - draw hyperbolas with even more precision (default 1)
jo32kf 4 io22aa 6 - draw region which is 10-4=6ms closer to jo32kf than to io22aa speedfactor 0.999 - compute with a 0.1% slower propagation speed
also shows thinner lines for 0.5 ms margin either side
path pa3fwm io22aa - draw great-circle path between two locations
label jo32kf home - put label "home" at the location
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