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Navigation Setup
The navigation setup submenu is used to select a variety of navigation informa-
tion including: position format, units of measure, and heading preferences. This
submenu is also used to select map datums, set the CDI scale and adjust the built-
in velocity filter. The following options are available:
• Position Format lets you select the coordinate system used to display
position. The following formats are available:
• hddd.dddddº (degrees) • hdddºmm.mmm’ (degrees and minutes)
• hdddºmm’ss.s” (deg/min/sec) • British grid
• German grid • Irish grid
• Maidenhead • Swedish grid
• Swiss grid • Taiwan grid
• UTM/UPS grid • Loran TD
For more information on the Loran TD positon format see Appendix ? on page ?
•Navigation Units selects the format for speed and distance measurements. You
may select from nautical, statute, or metric formats. (The default setting is nautical.)
• Depth Units selects the format for depth contour display on G-chart offshore chart
cartridges. Depth contours can be displayed in feet, meters, or fathoms. (The
default setting is feet.)
• Heading lets you select what reference is used in calculating heading information.
You can select to reference automatic magnetic variation, true north, grid heading,
or user magnetic variation. (The default setting is automatic.)
To enter a user magnetic variation:
1. Highlight the ‘Heading’ field and press
T
. Select the ‘User Mag Var’ option and press
T
.
2. Press
T
to access the variation field, and use the
R
keypad to enter the desired
variation. Press
T
to confirm.
• CDI Scale provides a list of six CDI scale settings for the map page CDI: +/-0.10,
0.50, 1.0 (default), 5.0, 10.0, and 25.0 miles or kilometers. The scale represents
the distance from the center of the scale to either end of the scale.
60
A. The GPSMAP 230 will also display position coor-
dinates in eight grid formats.
B. To enter a user magnetic variation, select the
‘User Mag Var’ option and enter a direction and
value in the variation field.
SECTION
9
SETUP MENUS
Navigation Setup
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