Humminbird HELIX 5 SI GPS Operation Manual page 179

Glossary
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 000°
is North, 090° East, 180° is South, 270° is West). See
Trackplotter
A navigation device that shows Present Position, along with Track, Waypoint, and Routes, but
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)
Greenwich England. (UTC is equivalent to Greenwich Mean Time (GMT)).
WAAS (Wide Area Augmentation System)
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.
Cross Track Error
Chartplotter
.
UTC is the "standard time" used in navigation and is the local time in
WAAS is complementary technology to GPS that provides
167
GPS & Navigation
Course Over Ground
and
Glossary - GPS & Navigation
.