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Astro 320 and DC40 Owner’s Manual 51
Customizing Your Device
NOTE: Do not change the position
format or the map datum coordinate
system unless you are using a map or
chart that species a different position
format.
From the main menu, select Setup >
Position Format.
• Position Format—sets the position
format in which a given location
reading appears.
• Map Datum—sets the coordinate
system on which the map is
structured.
• Map Spheroid—shows the
coordinate system the device is
using. The default coordinate
system is WGS 84.
You can customize the compass
settings. You can specify the type of
heading display and the type of North
reference used to calculate a heading.
NOTE: Unless you have a good
understanding of headings and North
referencing, use the default values.
From the main menu, select Setup >
Heading.
• Display—sets the type of
directional heading on the compass.
• North Reference—sets the north
reference of the compass.
• Go To Line (Pointer)—allows you
to select how the course appears.
◦ Bearing (Small or Large)—the
direction to your destination.
◦ Course (CDI)—the course
deviation indicator displays
your relationship to a course