Some visible area map calculated by the Kashmir are uploaded already in Home page of the Kashmir or @nifty FYAMAP LIB-3 (Forum Mountain Panorama and Map). You can see these map without calculation. If you create a new visible area map for certain mountain the calculation is of course necessary.
There are following two calculation method.
(1) The area in a circle defined with the center
position and the diameter is calculated.
(2) The area which is surrounded by the mouse
drag is calculated.
The method (1) takes much time for the calculation but this enables a calculation for the wide area. The method (2) takes less time because only area needed is calculated.