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Glossary GPS & Navigation Terms
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Zoom: Zoom is a feature that focuses in on a smaller area of the bottom to provide
enhanced resolution. With enhanced resolution, the angler can more easily see fish
hanging in structure or multiple fish hanging close together. Split screen zoom
divides the display into the full range view on the right, and the zoomed view on the
left. Humminbird® offers One-Touch® Zoom which allows the zoom feature to be
easily accessed from the regular sonar view with just one key press, eliminating the
need to use menus to access the feature.
Zoom, Bottom Lock: Bottom Lock Zoom is a feature that focuses on a smaller area
just above the bottom to provide enhanced resolution. Unlike regular zoom, it
continuously graphs the bottom at a constant point on the display regardless of
changes in depth. This "flattens" out the bottom contour, but is effective at showing
fish on or near the bottom, and is preferred by many saltwater anglers.
Acquisition Time: The length of time that a GPS receiver typically takes to
determine a position from at least three satellites. Humminbird® GPS receivers
provide very fast acquisition times (under one minute), permitting users to get
out on the water faster.
Alarm, Arrival: The audible alert that sounds when the boat is equal to or less
than the alarm setting (25 feet – 3000 feet) from the location of the destination
waypoint.
Alarm, Drift: Drift Alarm is an audible alert that sounds when the boat is equal
to or over the alarm setting (25 feet – 3000 feet) from the location where the
alarm was turned on.
Alarm, Off-Course: Off-Course Alarm is an audible alert that sounds when the
boat’s distance from the intended Track, (Cross Track Error), is equal to or over
the alarm setting (25 feet – 3000 feet). See Track and Cross Track Error.
Altitude: Altitude measures height above sea level. Altitude is a measurement
that can be provided by GPS.
Bearing (BRG): Bearing is the direction to a destination waypoint measured in
degrees from North (i.e. 321°, where 000° is North, 090° East, 180° is South,
270° is West).
Chartplotter: Chartplotter describes a navigation device that shows Present
Position on a Map, along with Tracks, Waypoints, and Routes. All Chartplotters
are also considered Trackplotters. All Humminbird® GPS Combo units are
Chartplotters. See Trackplotter.