ashtech ZY-12 Information Supplement page 69

To select this function, highlight 9:MAGVAR MODE and press [e]. The magnetic
variation mode screen (Figure 3.39) displays.
Figure 3.39. Magvar Mode
With the magnetic variation field highlighted, press + or - to toggle between the
three modes available: TRUE, AUTOMATIC, or MANUAL.
When the TRUE mode is selected, the COG, CTD, and bearing values are
displayed using true degrees (°T).
When the AUTOMATIC mode is selected, the magnetic variation used to display
the COG, CTD, and bearing values are shown in the AUTO field. This value is
determined, based on the current latitude and longitude, from the magnetic
variation table. The COG, CTD, and bearing values are displayed in magnetic
degrees (°Mg).
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Screen Descriptions