10 Apr 2008 News for NTIA/ITS HF Propagation Models (WINDOWS version) 10 Apr 2008 1. A result of the previous version (08.0121W) was that the longitude in the grid file for Lat/Lon calculations could have looked confusing. I had modified the Longitude so that it would always be in the range [0 to 360] (as required by ICEPAC). . I have changed this so that if you specify the range to be [-180 to 180] the output will be that. This will center the world plot at Longitude = 0. If you specify the range to be [0 to 360], the output will also be in that range. This will center the world plot at Longitude = 180. This affects all of the area coverage programs.