Undulation Table Resolution

The default undulation table used by the OEM4 (FW 2.312) and the OEMVx (FW 3.000) is OSU89B, which has latitude steps of 1 degree and longitude steps of 3 degrees. (i.e., the resolution window is 1 x 3 degrees) The undulation table can be altered using the command: UNDULATION EGM96 ..to get the EGM96 table, which has a more refined resolution every 0.5 degrees for both latitude and longitude. (i.e., the resolution window is 0.5 x 0.5 degrees)