NorthStar 961 Reference Manual page 378

Glossary
Phantom loran
PPNM
precipitation static
queuing waypoints
radar
radar plotter
rhumb line
satellite
secondaries
Selective Availability
sentence
Page G-6
Northstar's exclusive loran-simulation feature that converts
GPS position information into Loran-C TDs—while you
navigate with GPS or DGPS.
Pulses Per Nautical Mile.
Precipitation-induced electrical charge that can build up on
antenna surfaces, creating poor radio reception. Also known as
P-Static.
The process of specifying a trip one or more waypoints in
advance—as you're navigating. You queue waypoints by
adding new coordinates to the end of your trip.
A device or system that emits radio waves for navigational
purposes.
A navigation device tracking radar data as well as waypoints.
A constant, true direction to your destination, which appears
as a straight line on a Mercator grid. Compare with great
circle.
route A group of two or more pre-defined waypoints that form a
connected path to and/or from specific locations. In its
simplest form, a route can be a straight line to a single
waypoint.
SA Selective Availability. The (former) intentional degradation of
the GPS signal by the U.S. Department of Defense.
An object orbiting the earth. GPS satellites are controlled by
ground stations, and transmit signals that can be used to
calculate position and speed.
The "slave" loran transmitters in a chain of at least three
stations.
See SA.
A group of data in one of several formats defined by the
National Marine Electronics Association (NMEA).
SNR
Signal-to-Noise Ratio. A guide number for determining the
relative quality of GPS, DGPS, or loran signals as compared to
background radio noise.
SOG Speed Over Ground. The actual speed of your vessel relative to
the sea bottom.
961/962 Operations and Reference Manual, Rev. A