GAPS - User Guide
PTSAX
Transponder relative Positioning Message relative to GAPS array - GAPS orientation
(Relative coordinates and depth).
$PTSAX,#nnnnn,hhmmss.sss,dd,mm,yyyy,bbb,xxxxx.x,yyyyy.y,p,oooo.oo,d,cccc.cc*ck
Example: $PTSAX,#16069,124544.449,18,12,2017,1,17.95,-25.58,F,1013.10,1,9999.00*27
#nnnnn
hhmmss.sss
dd
mm
yyyy
bbb
xxxxx.x
yyyyy.y
p
oooo.oo
d
cccc.cc
*ck
Recurrence frame Number
Time in hours, minutes, seconds ,milliseconds
Day jj = 0 to 31
Month mm =1 to 12
Year
Transponder #: 1 to 128
X coordinate (+ forward) in meters
Y coordinate (+ starboard) in meters
Position validity (X, Y, Z): 0 to F: binary code of acoustic channel validity
Calculated depth in meters
Depth validity (0: None 1: Calculated 2: Sensor)
Sensor depth in meters
Hexadecimal checksum ('*' precedes the checksum value)
● Position validity: The value represents the acoustic hydrophone validity on 4 bits (from
0000 to 1111). 0 means channel not valid and 1 hydrophone operating properly. GAPS can
still output valid positions even if the validity is not 1111 (three channels are enough). All
output positions are valid.
> 1111 --> F (all 4 hydrophones OK)
> 1110 --> E (hydrophone #1 NOK)
> 1101 --> D (hydrophone #2 NOK)
> 1011 --> B (hydrophone #3 NOK)
> 0111 --> 7 (hydrophone #4 NOK)
● Calculated depth / Sensor depth: The GAPS know only one depth that is the fusion of
both depths (calculated and sensor). This “optimized” depth is in the “Calculated depth”
field.
● Sensor depth: if the Acoustic Transponder has no sensor, the value transmitted is 9999.
The X and Y positions are relative to the GAPS Acoustic Array.
194 MU-GAPS-AN-005-H - November 2019
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