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H
H
OW THE
The magnetic compass is one of the first known instruments for
navigation. It relies on the earth's magnetic field to align a magnetic
pointer towards North, also known as Magnetic North.
A compass' Magnetic North is affected by the local variations in the
earth's magnetic field around the globe. Nautical charts will often
provide the magnetic declination, or magnetic variation, for a local
area so that you can confirm that Magnetic North matches True North.
If you have trailered the boat to a new location, the compass'
operation may also be affected by a different magnetic zone. The
Humminbird control head compensates for magnetic declination and
also allows you to make additional adjustments from the menu
system. The details of these features are described in this manual.
Overview
S
EADING
ENSOR
When the Sensor is connected to the
control head, the heading from the internal
compass will be displayed in digital format.
The Heading is the direction the boat is
pointing, where 000° is North, 090° is East,
180° is South, and 270° is West.
Due to wind and waves, the boat is often
traveling in a slightly different direction
than its heading. The direction of travel, or
Course Over Ground, is provided by the GPS
receiver. You can use the compass Heading
with the GPS Course Over Ground and
Bearing to navigate a route.
W
ORKS
3
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