Plots the visibility and horizon from any specified point. A polar/bearing type map is generated, with horizon distance being shown by distance out from the centre, and horizon angle of up to ñ 0.8ø by colour.
Bearing resolution and maximum distance out may be entered, but default values to suit the specified site are generated by just pressing return at the appropriate times. Location, in any form, may be specified on the command line.
Mouse cursor indicates NGR and height of any particular point and distance / bearing from the centre. Again, this is of dubious accuracy as it employs the Pythagorean flat Earth calculation method.
Clicking then left mouse button identifies the nearest named site.