958 Operator’s Manual, Rev. A
Page 207
great circle
Shortest possible path between two points on the surface of a
sphere.
GRI
G
roup
R
epetition
I
nterval. 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.
HDOP
H
orizontal
D
ilution of
P
recision.
heading
The compass direction toward which the longitudinal axis of a
vessel points.
knot
One nautical mile per hour.
latitude
Imaginary lines on the earth's surface running East/West and
expressed in degrees (0-90) north or south of the Equator.
Used with the North/South lines of longitude to determine
position.
leg
The line, or path, between any two adjacent waypoints in a
route.
leg-up
An orientation of the
CHART
screen in which the viewing
angle matches your desired track when navigating, on a
leg-by-leg basis.
longitude
Imaginary lines on the Earth's surface running North/South
and expressed in degrees (0-180) east or west of the Prime
Meridian (a line running from the North to South Pole, passing
through Greenwich, England).
Loran-C
LO
ng
RA
nge
N
avigation. A system of land-based radio
transmitters emitting precisely timed pulses that are received
and translated into position “fixes” by a loran receiver. The 958
can convert and display its GPS coordinates into Loran-C
position measurements, or TDs.
loran chain
A group of loran transmitters comprising a master station and
at least two secondary stations.
loran receiver
An electronic position finding device that receives pulses from
loran stations.
magnetic variation
The difference between magnetic North and true North. Since
the difference varies according to geographic location, the
Summary of Contents for 958
Page 1: ...NORTHSTAR 958 Integrated Navigation System Operator s Manual P N GM958UM Revision A ...
Page 2: ......
Page 8: ...Page iv 958 Operator s Manual Rev A ...
Page 26: ...Page 18 958 Operator s Manual Rev A Chapter 1 Getting Started ...
Page 128: ...Page 120 958 Operator s Manual Rev A Chapter 8 Understanding Waypoint Route Navigation ...
Page 150: ...Page 142 958 Operator s Manual Rev A Chapter 10 Understanding Radar Functions ...
Page 198: ...Page 190 958 Operator s Manual Rev A ...
Page 204: ...Page 196 958 Operator s Manual Rev A ...
Page 212: ...Page 204 958 Operator s Manual Rev A ...