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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.
GPS & Navigation Terms:
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.
Cold Start: Cold Start refers to the procedure that a GPS receiver must perform when it
does not have historical information regarding its current location. This procedure
typically lasts for several minutes, and may be experienced upon first power up of the
receiver, or if the receiver has been moved a great distance.
Course Over Ground (COG): Course Over Ground is the current direction the boat is
traveling measured in degrees from North (i.e. 321°, where 000° is North, 090° East, 180°
is South, 270° is West). When the Course Over Ground is equal to Bearing, the boat is
said to be “On Course” and will arrive at the destination in the most efficient manner.
COG is often confused with Heading. See Heading.
Cross Track Error (XTE): Cross Track Error is the straight-line distance of the boat from
the intended Track. XTE measures how far the boat is off course, and also triggers the
Off Course Alarm. See Track.
Differential GPS (DGPS): Differential GPS is a system to improve the position accuracy
of the Department of Defense GPS through the use of secondary “correction signals”
broadcast from ground stations around the coastal United States and on some inland
waterways. These correction signals are provided by the USCG and received by an
auxiliary Differential Beacon Receiver (DBR) that connects to the GPS receiver. The
advent of WAAS has largely negated the need for the added expense of a DBR in the
United States.
Distance To Go: Distance To Go is the straight-line distance between Present Position
and the Destination Waypoint. DTG and SOG (Speed Over Ground) are used to calculate
Time To Go. See Time to Go and Speed Over Ground.
Estimated Position Error (EPE): Estimated Position Error is a calculation that indicates the
potential position inaccuracy the user may experience due to a variety of GPS factors
which include satellite position in the sky, signal strength and others factors.
Fix Type: Fix Type indicates whether the GPS receiver is providing 2D fix or 3D fix. A 2D
fix requires only three satellites and provides only latitude and longitude. A 3D fix
requires four or more satellites, and provides latitude, longitude and altitude.
GPS: GPS is an acronym for Global Positioning System. GPS provides accurate position
(latitude, longitude, altitude) information virtually anywhere on the earth through
satellite technology and personal receivers on the ground. A series of geosynchronous
satellites broadcast a unique signal toward the earth once per second. A GPS receiver,
