On Line URSL Predictions Point to point HF predictions anywhere in the world. Short and long path.
Longitude is entered as degrees east.
As the name implies, the short path is the shorter of the two paths and the long path is the path which is longer than half the circumference of the earth. Therefore the order in which the terminals are entered is important because it determines the assumed path of the radio wave. No autoscaled data avaliable is inidcated by 999.