07 Dec 2016 News for NTIA/ITS HF Propagation Models (WINDOWS version) 07 Dec 2016 1. ICEAREA & VOAAREA had a problem if a calculated grid point was exactly 10,000km from the transmitter if the smoothing method was used. The "short path" model is used for distances < 7,000km. The "long path" model is used for distances > 10,000km. Thus a smoothing algorthim was used to cover the distances in between. But there was an "IF" statement that if the distance was exactly 10,000km, smoothing was done, but a previous "IF" statement did not calculate the "short path" results. Therefore, a value (that was never calculated) was used, and that caused a floating point stack error. It would be very unusual for a calculated grid point to be exactly 10,000km from the transmitter, so this is a very rare occurance. RECAREA did not seem to have this problem because it has a different smoothing algorithm.