Garmin MX20 Installation Manual - page 81
I/O
Specifications
MX20 Installation Manual
560-1025-09 Rev E
A-3
Table A-3. Moving Map Binary Route Data
Byte Data
Format Description
1 w
Item
designator
2-3
dd
Current waypoint number in ASCII (01h to 20h)
4 xiannnnn
Sequence
number
x = undefined
i = 1 if last waypoint
a = 1 if active waypoint
nnnnn = unsigned binary waypoint number
5-9
ddddd
ASCII waypoint identifier
10
11
12
sddddddd
xxmmmmmm
xhhhhhhh
Waypoint latitude - packed, unsigned binary
s = sign: 0 for north, 1 for south
ddddddd = degrees
mmmmmm = minutes
hhhhhhh = hundredths of minutes
x = undefined
13
14
15
16
sxxxxxxx
sddddddd
xxmmmmmm
xhhhhhhh
Waypoint longitude
s = sign: 0 for east, 1 for west
ddddddd = degrees
mmmmmm = minutes
hhhhhhh = hundredths of minutes
x = undefined
17
18
nnnnnnnn
nnnnnnnn
Magnetic variation at waypoint
LS byte (msbit...lsbit)
MS byte (msbit...lsbit)
Two’s complement binary in sixteenths of degrees, easterly
variation is positive.
19
ASCII carriage return (0Dh)