NorthStar 951X Operator's Manual page 191

readout
The panel of graphic images and alphanumeric characters
used by the unit to display navigation data.
secondaries
The "slave" loran transmitters in a chain of at least three sta-
tions.
SNR
Signal to Noise Ratio. Guide number for determining the rela-
tive quality of GPS, DGPS, or loran signals as compared to
background radio "noise."
TD
Time Difference. The measured amount of time—in millionths
of a second—between loran signals received from the master
and the secondary stations.
track
A desired line of travel.
waypoint
A particular location (defined for navigation purposes by its
lat/lon, distance and bearing, or TDs), used as an intermediate
or final destination.
951/952 Operator's Manual Rev. B Page 181