0 initialization and time to first fix – BendixKing KLN 900 - Abbreviated Guide User Manual
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waypoints in the database having the identifier. Below the identifier is a
list of the waypoint types (APT, VOR, NDB, INT, SUP) and the associated
countries which use the identifier. To see an example of a Duplicate
Waypoint page perform the following steps:
• Press
D.
• Turn the left inner knob to select the letter D as a waypoint identifier. “D”
is the full identifier of several waypoints in the KLN 900 database.
• Press
E. The Duplicate Waypoint page will be displayed on the left
side . At the time of this writing, there were eleven waypoints in the
database having the identifier “D”. As in this example, if there are more
than four waypoints having the same identifier, only the first four are ini-
tially shown. The list includes an NDB in Canada, an NDB in Cuba, an
NDB in the United States, and an NDB in Libya. The cursor will be over
the first waypoint listed. They are listed with the waypoint closest to the
aircraft’s present position displayed first and the waypoint farthest from
the aircraft displayed last. To view the rest, rotate the left outer knob
clockwise. Doing so will move the flashing cursor over waypoints two,
three, and four and then will cause the waypoint list to “scroll” so that the
other waypoints in the list may be seen. To select the desired waypoint,
move the cursor over the appropriate choice.
• Press
E to view the waypoint page for the selected waypoint.
• Press
E to approve the waypoint page.
3.0 INITIALIZATION AND TIME TO FIRST FIX
Since the KLN 900 stores its position and other required parameters in
memory when power to the unit is removed, it is seldom necessary to aid
the unit in reaching a NAV ready condition. The time required from power
on until the KLN 900 determines its present position and is therefore ready
to navigate is called “time to first fix.” The time to first fix is normally a few
minutes or less. In order for the KLN 900 to reach a NAV ready condition, it
is necessary to meet the following conditions:
1. The KLN 900’s “almanac” data must be current. Almanac data is crude
orbital information for all the satellites and is used for initial acquisition
when the KLN 900 is first turned on. This data is stored in the KLN 900’s
non-volatile memory and is considered current for up to six months.
Each satellite sends almanac data for all satellites. Since the KLN 900
routinely updates the almanac data during normal operation, the
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