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®®
Figure 31 – DSM250 Units Menu
5.2.7.1 Heading
This menu item allows you to select whether heading, course, and bearing information is displayed in
true or magnetic measurements. True heading can only be displayed if a variation is available on the
NMEA 2000
®
bus.
If the DSM250 is not showing heading or COG (i.e., no needle on compass rose or dashes for digital
displays), it’s probably a good indication that variation isn’t available on the network. The DSM250
can’t calculate true heading given magnetic heading from a compass if variation isn’t available.
Likewise, the DSM250 can’t calculate magnetic course given true course from a GPS if variation isn’t
available. You can setup a favorite screen to display variation, which will help you determine whether
or not you have a product on the network broadcasting variation information (Maretron’s GPS’s use
the World Magnetic Model to broadcast variation).
5.2.7.2 Depth
This menu item allows
you to select the units to be used for the display of all depth-related
information. Units that may be selected are the following:
• Meters
• Fathoms
• Feet
5.2.7.3 Distance
This menu item allows
you to select the units to be used for the display of all distance-related
information. Units that may be selected are the following:
• Nautical Miles
• km
• Statute Miles