Page B-2
GTN 625/635/650 TSO Installation Manual
Rev. C
190-01004-02
Table B-1 describes the Type 1 output sentence item designator (id) and item data (dddd) fields. If data
for these sentences is invalid or unavailable, dashes ("-") are used to fill in all non-blank character
positions.
Table B-1. Type 1 Output Sentence Format
Ident (1 byte)
Data (10 bytes)
1 2 3 4 5 6 7 8 9 0
Description
z
a a a a a
Current GPS altitude in feet *
A
s d d m m h h
Current latitude, where:
s - N (north) or S (south)
dd - degrees
mm - minutes
hh - hundredths of minutes
B
s d d d m m h h
Current longitude, where:
s
- E (east) or W (west)
ddd
- degrees
mm
- minutes
hh
- hundredths of minutes
C
d d d
Track in whole degrees
D
s s s
Ground speed in knots
E
d d d d d
Distance to waypoint in tenths of nautical miles
G
s n n n n
Cross track error, where:
s
- L (left) or R (right) of course
nnnn
- error in hundredths of nautical miles
I
d d d d
Desired track in tenths of degrees
K
c c c c c
Destination waypoint identifier (will be blank filled
on right if less than 5 characters in identifier)
L
d d d d
Bearing to destination waypoint in tenths of
degrees
Q
s d d d
Magnetic variation, where:
s
- E (east) or W (west)
ddd
- tenths of degrees
S
- - - - f
NAV valid flag status, where:
f - N (NAV flagged) or - (NAV valid)
T
- - - - - - - - -
Warnings status, only data transmitted are dashes
(-). Used to indicate end of Type 1 sentences.
l (lower case
Lima)
d d d d d d
Distance to destination waypoint in tenths of
nautical miles.
* The altitude is not output if the RS-232 port is configured as ―Aviation Output 2.‖
* The line feed character is not output if the RS-232 port is configured as ―Aviation Output 2.‖
