System Operation
3-124
GNS-XLS Flight Management System
Rev. 3
Sep/96
NAVIGATION AT EXTREME LATITUDES (North of 70° N or
South of 60° S)
CAUTION: THE PROCEDURES LISTED IN THIS SECTION CON-
TAIN INSTRUCTIONS FOR OPERATION OF THE GNS-Xls AT
SPECIFIED LATITUDES BEYOND THE AUTO-COMPUTED MAG-
NETIC VARIATION MODEL. IN ALL CASES THE FLIGHT CREW
OF ANY AIRCRAFT OPERATING AT THESE LATITUDES MUST
CONSULT THE FLIGHT MANUAL SUPPLEMENT IN ORDER TO
OBTAIN SATISFACTORY PERFORMANCE AND ACCURACY.
Manual Magnetic Variation Entry
1. NAV Key - DEPRESS to display until NAVIGATION Page 3 is
displayed.
2. Line Select Key - DEPRESS to place cursor over the VAR value
field.
3. Local Variation - INSERT (E or W first).
4. ENTER Key - DEPRESS. (MAN) will be annunciated adjacent to
the VAR field.
Returning To Automatic Variation
1. NAV Key - DEPRESS until NAVIGATION Page 3 is displayed.
2. Line Select Key - DEPRESS to place cursor over the VAR value
field.
3. BACK Key - DEPRESS. AUTO? will be displayed to advise the
pilot of the impending change.
4. ENTER Key - DEPRESS.
NOTE: Insertion of E or W followed by ENTER will also revert the
system to Auto Variation.
TRUE HEADING
Aircraft Equipped With TRUE/MAG Switch
1. TRUE/MAG Switch - Place in TRUE position.
NOTE: Once the TRUE/MAG Switch is placed in the TRUE position
T is displayed adjacent to BRG, HDG and TK since they are now ref-
erenced to true north.
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