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Serial Interface Specifications
Apollo GX50/60/65 Installation Manual
59
BINARY NEAREST LIST DATA (WHEN EXTENDED DATA IS ENABLED
ONLY)
The nearest waypoint lists are sent one waypoint per data transmission set. The lists are
sent in the following order:
• LFAC
• VOR
• NDB
• INT
• User
There is a maximum of twenty waypoints per type. The waypoints are a maximum of 600
nm from the current position. The waypoints are order by distance from current position
nearest to farthest. The maximum time to send all lists is 100 seconds. Each list is updated
just prior to the first waypoint in the list being sent. If a list is empty a shorter record will
be sent with the List Item Number set to 0xFF.
Table 8 Nearest Waypoint List Data
Byte Format Description
1 Z
‘Z’ Item Designator
2 sddddddd
List Item Number: Packed, unsigned binary values
s = 1 End of list, 0 all other
ddddddd = 1 – 20 list waypoint index
sddddddd = 0xFF List Type is EMPTY (BYTE 4 terminate Item)
3 t
Waypoint Type:
t = {a (airport) || v (VOR) || n (NDB) || i (INT) || u (USER)}
4 Cr
‘\r’ Item Terminator <0x0d> (ONLY IF BYTE 2 = OxFF)
4-8 ddddd
ASCII Waypoint Identifier
9
10
11
sddddddd
xxmmmmmm
xhhhhhhh
Latitude of waypoint. Packed, unsigned binary values for degrees,
minutes and hundredths of minutes.
s = 0 North latitude, 1 South latitude
x = undefined
ddddddd = Latitude degrees
mmmmmm = Latitude minutes
hhhhhhh = Latitude hundredths of minutes
12 sxxxxxxx
Longitude of waypoint. Packed, unsigned binary values for degrees,