GAPS - User Guide
$__GLL
$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,A,a*ck
llll.ll
a
yyyyy.yy
a
hhmmss.ss
A
*ck
Latitude
N : North S : South
Longitude
E : East W : West
UTC time of position
A= data valid; V= data invalid
Hexadecimal checksum ('*' precedes the checksum value)
Important notes
● Very often for TRIMBLE GPS the 1 PPS signal must be associated to the UTC telegram
and not the ZDA. If the iXblue inertial navigation system receives at the same time ZDA,
UTC and RMC time telegram it uses the telegram with the following priority: UTC, ZDA,
RMC.
● For TRIMBLE GPS, the proper settings is Time + PPS Rising while using PPS + UTC.
Avoid using ZDA only on TRIMBLE GPS.
● If no GST string is received, the quality factor is interpreted by INS as follow. At input INS
converts quality factor to standard deviation on position according to correspondence
table.
H.2 Pressure Datagram PMEVL
$PMEVL
Data received: Pressure value
$PMEVL,XP,MEA,C,VVVVV*cc<CR><LF>
XP
MEA
C
VVVVV
*cc
is the transponder ID (from 001 up o 128)
is a mnemonic
is the analog channel, C = 8
is the Pressure value
VVVVV = 0 to 65535 dBars (integer)
or VVVV.V = 0.0 to 9999.9 dbars (float)
is the checksum
Conversion of the pressure to immersion:
● G is the gravity: 9.79337750716075
● D is the water density: 1.026952
● A is the atmospheric pressure in mb: 1015.0
● P is the pressure in mB
MU-GAPS-AN-005-H - November 2019 179
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