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Getting Started
7
Operating Modes
The device displays current speed on the lower display and heading in degrees on the upper display. In
Basic firmware the SC1 modes cannot be changed for either display. Modes can be edited and more
modes, VMG, tactical compass, timer and start line, are available in the Full firmware. Refer to the Full
firmware manual for more information. The firmware on the device can be updated by connecting the
SC‐1 to the PC.
The below figures shows speed of 16.9 knots and compass heading of 69 degrees:
Speedometer Mode
In Speedometer mode the display will show your current speed updated at 2Hz (twice a second). The
speed can be displayed in knots, miles/hour, kilometers/hour or meter/second by editing the device
settings. The default is to display speed in knots.
Compass Mode
In compass mode, the device displays either true or magnetic heading at an update rate of 2Hz (twice a
second). True heading is the direction you are moving referenced to true north. Magnetic heading is
the degrees you are heading in reference to the local magnetic north. When using a magnetic compass
in conjunction with the SC‐1, setting the compass declination to the local declination is useful since both
instruments will be referenced to magnetic north. By default the compass displays true heading, to
display magnetic heading the local magnetic declination must be defined in device settings.
The SC‐1 displays heading only when your speed is greater than 1 knot, otherwise it will show a heading
of 0 degrees regardless of which direction you are actually moving.
The difference of the SC‐1 to a conventional magnetic compass is that the SC‐1 measures the direction
the device is moving in rather than the direction it is pointed in.
A major benefit of the SC‐1 over a conventional magnetic compass is that it will give you accurate
heading information, regardless of the orientation in which it is mounted on your boat. SC‐1's compass
reading depends only on the direction you are moving, not the direction the device is pointing.
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