D Logs Summary
MiLLennium GPSCard SW Version 4.503/4.52 Command Descriptions Manual Rev 2 217
SPHA/B Speed and Direction Over Ground

This log provides the actual speed and direction of motion of the GPSCard antenna over ground, at the time of

measurement, and is updated up to 10 times per second. It should be noted that the GPSCard does not determine

the direction a vessel, craft, or vehicle is pointed (heading), but rather the direction of motion of the GPS antenna

relative to ground.

SPHA

Structure:
Example:
$SPHA,640,333111.00,0.438,325.034,2.141,0*02[CR][LF]

SPHB

Format: Message ID = 06 Message byte count = 52

$SPHA week seconds hor spd trk gnd
vert spd sol status *xx [CR][LF]
Field # Field type Data Description Example
1$SPHA Log header $SPHA
2week GPS week number 640
3seconds GPS seconds into the week 333111.00
4hor spd Horizontal speed over ground, in meters per second 0.438
5trk gnd Actual direction of motion o ver ground (track over ground)
with respect to True North, in degrees 325.034
6vert spd Vertical speed, in metres per second, where positive
values indicate increasing altitude (up) and negative
values indicate decreasing altitude (down)
2.141
7sol status Solution status as listed in Table D-1 0
8*xx Checksum *02
9[CR][LF] Sentence terminator [CR][LF]
Field # Data Bytes Format Units Offset
1Sync 3char 0
(header) Checksum 1char 3
Message ID 4integer 4
Message byte count 4integer 8
2Week number 4integer weeks 12
3Seconds of week 8double seconds 16
4Horizontal speed 8doub le metres per second 24
5Track over ground (TOG) 8double degrees 32
6Vertical speed 8double metres per second 40
7Solution status 4integer 48