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|  MIL-D-70789A (AR)
APPENDIX D
***************************************************************************
30.4.3
Message: NAVIGATION DATA
From: DRU To:
Prime System
Number of Data Characters:
22
Data Format:
Binary 2's Complement
MESSAGE STRUCTURE
ERROR DET.
STATUS
ECHO
CODE (E) FLAG(F)
IDENTIFIER(I) S1,S2
DATA(D)
FLAG(F)
SEQ#(N)
16 bits 01111110
D1-D22
01111110 XXX
00001
16 Bits
The 22 characters of this message contain casting, northing, altitude,
distance traveled, pointing device geodetic or grid azimuth, vehicle
attitudes, and DRLI spheroid, hemisphere, and zone.
D1 , D2, D3 Characters (24 bits, unsigned binary) Northing
Range:
0 to 10,000,000 meters
Resolution: 1 meter
Altitude
D4 , D5 Characters (15 bits)
Range:
-16,384 to +16,383 meters**
Resolution: 1 meter
D6 , D7, D8 Characters (17 bits, unsigned binary) Distance Traveled
Range:
0 to 1,310,710 meters**
Resolution: 10 meters
Pointing Device
D9, D10 Characters (16 bits unsigned)
Geodetic Azimuth or-
Range:
0 to 6,399.9 Mils
Grid Azimuth
Resolution: 0.1 mil
Vehicle Cant or Roll
D11, D12 Characters (15 bits)
-1638.4 to +1638.3 mils**
Range :
Resolution: 0.1 mil
Vehicle Pitch
D13, D14 Characters (1S bits)
Range:
-1600 MilS to +1600 mils
Resolution: 0.1 mil
Vehicle Geodetic Azimuth
D15, D16 Characters (16 bits, unsigned binary)
or Grid Azimuth
0 to 6,399.9 mils
Range:
Resolution: 0.1 mil
If BCU Parameters Configuration
D17 Character (MSH unsigned)
Flag reset: Set to 0
0 to 15
Range:
If BCU Parameters Configuration
Flag set: BCU spheroid
181
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