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Page 136 Glossary
GlossaryGlossary
Glossary Rev. D
ETA
ETAETA
ETA: Estimated Time of Arrival at the next waypoint, as calculated by
the 941X according to your present speed of advance (SOA) and
distance to the waypoint.
ETE
ETEETE
ETE: Estimated Time Enroute to the next waypoint, as calculated by the
941X according to your present speed of advance (SOA) and dis-
tance to the waypoint.
GPS
GPSGPS
GPS: Global Positioning System. A navigation system using signals from
earth-orbiting satellites. The system is capable of providing high
accuracy under all weather conditions.
great circle
great circlegreat circle
great circle: Shortest possible path between two points on the surface of
a sphere.
GRI
GRIGRI
GRI: Group Repetition Interval. The characteristic identifying period of
signals emitted by each loran transmitting chain. The identifier
9960 (Northeast US) indicates that the gap between the start of
any two adjacent master signals is 99,600 microseconds long.
interference
interferenceinterference
interference: The electromagnetic interruption of a radio signal causing
poor signal reception. Interference may originate from external
sources (such as other radio transmitters) or from the vessel itself
(such as alternator noise or precipitation static).
latitude
latitudelatitude
latitude: Imaginary lines on the earth's surface running East/West and
expressed in degrees (0-90) north or south of the Equator. Used
in conjunction with the North/South lines of longitude to deter-
mine position.
leg
legleg
leg: The path between adjacent waypoints of a route.
longitude
longitudelongitude
longitude: Imaginary lines on the Earth's surface running North/South
and expressed in degrees (0-180) east or west of the Prime Me-
ridian (a line running from the North to South Pole, passing
through Greenwich, England).
Loran-C
Loran-CLoran-C
Loran-C: Acronym for LOng RAnge Navigation. System of land-based
radio transmitters emitting precisely-timed pulses which are re-
ceived and translated into position “fixes.”
magnetic variation
magnetic variationmagnetic variation
magnetic variation: The difference between magnetic North and true
North. Since the difference varies according to geographic loca-
tion, the Northstar 941X automatically calculates magnetic varia