User Manual

Present Position 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 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 (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 (SA) 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) The measurement of the boat’s progress across a given

distance and 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.

Time To Go (TTG) The estimated time required to reach the destination waypoint. TTG

is calculated using the SOG and DTG. See

SOG and DTG.

Track

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

Glossary