Maretron DSM150, User Manual

Page: 182 / 274

DSM150
User’s Manual
Page 166 Revision 1.4.18
Figure 181 below shows the NMEA 2000
®
source selected.
Figure 181
– Setting Variation Source to NMEA 2000 ®
Only
If there is no magnetic variation source available on either the NMEA 2000
®
or the NMEA 0183
interface, and you wish to display true heading information, you may manually enter a magnetic
variation. To set a manual variation value, you must change the variation source by pushing the Enter
key (
) with the “Variation Source:” menu item selected. This highlights the next field where you
select “Manual Entry:” by scrolling (
or ) throug
h the options until you reach “Manual Entry:”.
Pressing the Enter key (
) with the “Manual Entry:” menu item selected takes you to the screen
shown in Figure 182.
Figure 182
– Entering Manual Variation
Press the Scroll Up (
) or Scroll Down ( ) key to change the amount of East or West variation.
Press the Accept Key ( ) when the desired number is shown. You may also disable manual
variatio
n by setting the value to “Disable”; this option appears between the values 0.0°E and 0.1°W
when scrolling through the values. When manual variation is disabled, the SSC200 will not transmit
any variation information and heading information will be available only in magnetic heading format.