Garmin MX20 - Table A-3. Moving Map Binary Route Data

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 <CR> ASCII carriage return (0Dh)