NorthStar 958, Operator'S Manual

Page: 214 / 232

Page 206 958 Operator’s Manual, Rev. A
course-up
An orientation on the chart screen in which the viewing angle
matches your true course during the last few seconds, as
determined by the GPS receiver.
coverage
The extent to which a geographical area is encompassed by
usable GPS or loran signals.
cross-track error
The difference between your desired track and your actual
track; that is, how far off you are from your intended course
line.
cursor
The display panel indicator that shows which character or
character field is ready to be changed, acknowledged, or
entered by the user. It’s activated and positioned by the user
when required. The 958’s cursor appears as an arrow or a
flashing block, depending on whether you’re choosing or
entering data. Also known as the red circle on the
CHART
screen, which you manually activate and position.
DGPS
D ifferential G lobal P ositioning S ystem. A technique developed
by the U.S. Coast Guard for correcting basic GPS position to
increase its accuracy from 20-30 meters (65-100 feet) to 1-3
meters (3-9 feet).
ephemeris
Data used to calculate exact satellite positions, continually
updated and derived from information relayed to the 958 in
each satellite’s data stream.
EBL
E lectronic B earing L ines. Markers that you can place on top of
the radar image to aid in navigation and in keeping track of
your surroundings.
ETA
E stimated T ime of A rrival at the next waypoint, as calculated
by the 958 according to your present speed of advance (SOA)
and distance to the waypoint.
ETE
E stimated T ime E nroute to the next waypoint, as calculated by
the 958 according to your present speed of advance (SOA) and
distance to the waypoint.
GPS
G lobal P ositioning S ystem. A navigation system using signals
from earth-orbiting satellites. The system is capable of
providing high accuracy under all weather conditions.