NorthStar 8000i System Operation Manual page 200

G
Gain, Gain mode
An adjustable setting (the Gain mode) that specifies the amount of echo
return detail (Gain) displayed on screen.
gasoline (petrol)
A type of fuel.
genre
A way of grouping music by style, e.g. Rock, Classical.
greyscale
A method of displaying information without using colour.
guard zone
An area around the boat, set up by the operator and defined by distance
and bearing. If an object (e.g. another boat) enters the guard zone, an alarm
is activated.
H
harbor, harbour
An area of sheltered water that is protected by land or manmade structures.
head-up
Chart Orientation Mode: The chart is oriented so that the boat is facing the
top of the screen on its current bearing, taken from the compass or the
course of the boat over the ground.
I
icon
Small picture or graphical representation of an object or physical element
displayed on the screen. Icons are used extensively in Charting to show
items such as boats, rocks, navigational aids, sea states, and the type of
bottom.
Imperial gallon
A unit of volume equal to 1.20094 US gallons.
inboard
Anything that is located within the hull or bulwarks of the boat.
interference filter
Reduces interference (e.g. from engine noise) in the echo returns and
therefore provides a clearer display.
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Northstar 8000i Operation Manual