Humminbird 1158c Combo Installation And Operation Manual page 230

Glossary GPS & Navigation
Track Line (TRK)
The planned line of travel between two waypoints, and it represents the most efficient
path between the two points because it is a straight line. The TRK is measured in degrees (i.e. 321°, where
Cross Track Error Course Over Ground
000° is North, 090° East, 180° is South, 270° is West). See and .
Trackplotter
A navigation device that shows Present Position, along with Track, Waypoint, and Routes, but
Chartplotter
NO MAP in the background. See .
Trolling Grid
A Humminbird® feature that displays a precise reference grid around a waypoint. This grid is
used as a guide pattern for trolling around a specific area to assure a more efficient and complete coverage
of that area.
UTC (Universal Time Constant)
UTC is the "standard time" used in navigation and is the local time in
Greenwich England. (UTC is equivalent to Greenwich Mean Time (GMT)).
WAAS (Wide Area Augmentation System)
WAAS is complementary technology to GPS that provides
enhanced accuracy through correction signals broadcast from Federal Aviation Administration WAAS
satellites stationed over the USA. These secondary signals are automatically received by the standard
Humminbird® GPS Receiver. With WAAS signal, GPS accuracy is improved to within 3 meters 95% of the
time. Outside the United States, regional governmental coalitions have created similar systems such as
EGNOS (Europe) and MSAS (Japan).
Waypoint
The saved location (latitude, longitude) of a point of interest that is stored in a GPS receiver's
memory. This can include a marker buoy, dock, fishing hole, or anywhere else the user may want to return
to. Humminbird® products offer the ability to name and assign a symbol to the saved location. Depth, Date,
and Time of Day when the waypoint was created is also saved.
Waypoint Target
A Humminbird® feature that displays a precise "bull's eye" around a selected waypoint.
This bull's eye is used to easily monitor boat position relative to a waypoint, and is useful for fishing over
submerged structure. With Waypoint Targets, a quick look at the screen lets you know how far off the
waypoint the boat has drifted.
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Glossary - GPS & Navigation