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Section 1
Navigation Key
The GNC 250XL features seven navigation pages to provide various position,
course, speed, status and planning information. The pages may be viewed by pressing
the
N
key and rotating the outer knob, or by pressing the
N
key repeatedly.
The CDI, map, NAVCOM and position pages are the primary pages used during
in-flight navigation, while the nav menu and status pages offer access to planning,
calculation and status functions. Note that rotating the outer knob clockwise will
continuously cycle through all the nav pages, whereas turning the knob counterclock-
wise will stop the page selection sequence at the CDI page.
Whenever the
N
key pages are in use, the indicator light (U) next to the
N
key will illuminate. If the GNC 250XL requires you to enter data on a navigation
page, a message prompt with specific instructions will appear and the indicator will
flash. If you leave the NAV page sequence for another set of pages, the last NAV page
displayed will appear when you return to the nav sequence.
11
SECTION
1
NAV KEY
Overview
Remember! The NAV pages will only display information
AFTER the position and navigational information has been
calculated from the satellites. If you are on the Position
page before the unit has calculated a position, you will be
able to enter an approximate position and altitude. This is
helpful in speeding satellite acquisition if the unit has
moved a great distance with the power off.
If you are not sure the GPS is actively calculating position,
check the receiver status field for ‘2D NAV’ or ‘3D NAV’ by
pressing the
N
key and rotating the outer knob until the
Satellite Status page appears. The current receiver status is
displayed at the top left of the page.
CDI page
NAV Menu 2
Position page
NAV Menu 1
Map page
Satellite status page
NAVCOM page
250xl manual 2 7/17/98 1:26 PM Page 11