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Time To Go (TTG): Time To Go is the estimated time required to reach the destination waypoint.
TTG is calculated using the SOG and DTG. See SOG and DTG.
Track: A Track is a series of saved points that define the past path of the boat. These Track Points
are saved at regular time intervals. Tracks are a useful and quick method to see where you’ve been,
and an easy guide to follow to get you back to the starting point. Generally, all GPS units have a
limited number of Track Points that can be saved before the unit runs out of memory and begins
erasing the first track points saved. Because of this, the user can adjust the Track Point Interval
menu to increase the amount of time between when points are saved, and thus extend the
distance covered by a track. Tracks can also be permanently saved to memory, and re-displayed at
the user’s option.
Track Line (TRK): The Track Line is the desired line of travel between two waypoints, and
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
Cross Track Error, Course Over Ground.
Trackplotter: Trackplotter describes a navigation device that shows Present Position, along with
Track, Waypoint, and Routes, but NO MAP in the background. See Chartplotter.
Trolling Grid: Trolling Grid is 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. Trolling Grid resolution be changed by zooming in or
out on the chart. The Trolling Grid can also be rotated on the display to orient it for optimal boat
course for wave and wind conditions.
UTC: UTC is an acronym for 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)). To display the correct Local Time in a Humminbird® GPS unit, the user must use the
Local Time Zone menu and select the time zone (i.e. EST, CST).
WAAS: WAAS is an acronym for 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: A Waypoint is 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.
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North, Magnetic: North is the principle reference point of the compass (i.e. North is 000°).
Magnetic North relies on the earth’s magnetic field to align a metal pointer generally towards True
North. However, due to local variations in the earth’s magnetic field around the globe, the
difference between True North and Magnetic North can be greater than 10°. See True North.
North, True: North is the principle reference point of the compass (i.e. North is 000°). True North
uses the axis of the rotation of the earth as the reference for North and is constant for all points
on the earth. Most GPS units default to True North as the setting. The GPS heading may vary from
the boat compass heading because the compass uses Magnetic North. Humminbird® GPS units
provide the option of selecting True or Magnetic readouts by using the North Reference menu. See
Magnetic North.
Present Position: Present Position is the current location (latitude, longitude) determined by GPS.
The Present Position is indicated on-screen by a directional boat icon if the boat is moving, or a
round symbol if the boat is stationary.
Route: A Route is series of waypoints linked together in a specific sequence to define a navigation
path between two points, and saved in the fishfinder’s memory. Routes are often used when
frequently traveling between two or more locations because it is a faster and more accurate
method than repeatedly selecting individual waypoints each time one travels through the same
area. Routes consist of a Start Waypoint, an End Waypoint, and a series of waypoints in between.
Users can begin navigation at the beginning, the end (to run the route in reverse) or at any
waypoint in between. See Waypoint.
SD: SD is an acronym for Secure Digital. An SD card is virtually identical in function to an MMC;
however, the speed at which information can be accessed is generally faster, the storage capacity
is generally larger, and the card has security features which can be used to prevent extracting the
data from the card. SD is the same format that many digital cameras use. See MMC.
Selective Availability: Selective Availability (SA) is a GPS system “feature” that can be
implemented by the U.S. Department of Defense (DoD) to degrade the accuracy of GPS
positioning information. With SA active, the GPS is accurate to within 100 meters 95% of the time.
With SA inactive, the GPS is accurate to within 45 meters 95% of the time. Currently, SA is inactive
and the consumer can enjoy the greater precision GPS provides; however, the DoD reserves the
right to activate SA at any time.
Speed Over Ground (SOG): Speed Over Ground is the measurement of the boat’s progress across
a given distance, and is the speed measurement provided by GPS. An alternate, Speed Through
Water, is provided by a speed paddlewheel, and is the measurement of the flow past the boat,
which may vary depending on current speed and direction. Speed Over Ground is optimal for
navigation because accurate destination times can be derived from this measurement.
Humminbird® products allow for input and display of both speed measurements.
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www.Busse-Yachtshop.de email: info@busse-yachtshop.de
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