<P>The command uses a routine MINIMUF 3.5 developed by the U.S. Navy and
used to predict the MUF given the predicted flux, day of the year,
hour of the day and geographic coordinates of the transmitter and
receiver. This routine is reasonably accurate for the purposes here,
with a claimed RMS error of 3.8 MHz, but much smaller and less complex
than the programs used by major shortwave broadcasting organizations,
<P>The command uses a routine MINIMUF 3.5 developed by the U.S. Navy and
used to predict the MUF given the predicted flux, day of the year,
hour of the day and geographic coordinates of the transmitter and
receiver. This routine is reasonably accurate for the purposes here,
with a claimed RMS error of 3.8 MHz, but much smaller and less complex
than the programs used by major shortwave broadcasting organizations,