$USTLC Target Location Message
The USTLC message provides the basic information needed to find the ROV in geographic coordinates. It is the message typically sent by Omniscan ROVLs with connected GNSS compasses.
Example:
$USTLC,1.0,MkIII,A,T,44.98626600,-93.57618590,,0.993873,0.009705,-0.001716,0.110093,,,,,,34,39,210625 130042.60,*0A
Format: $USTLC,mv,di,ch,cc,lt,ln,hd,qw,qx,qy,qz,sr,rb,re,ta,to,gn,sn,dtg,*hh
mv: version number of message format
di: device identifier {MkII, MkIII}
ch: channel {A, B}
cc: GNSS Compass connected {T, F}
lt: latitude where GNSS Compass is (blank if no position lock or no compass connected)
ln: longitude where GNSS Compass is (blank if no position lock or no compass connected)
hd: GNSS Compass heading (NED) (blank if no heading lock or no compass connected)
qw, qx, qy, qz: quaternion of ROVL receiver platform (ENU)
sr: slant range to ROV (blank if no ping detected)
rb: relative bearing to ROV (ENU) (blank if no ping detected)
re: relative elevation to ROV (ENU) (blank if no ping detected)
ta: latitude of ROV (blank if can't be computed)
to: longitude of ROV (blank if can't be computed)
gn: analog AGC gain, in decibels (range 16 – 82)
sn: Seconds since last autosync or distance sync command (valid Mk II only)
dtg: date/time group, UTC, format "ddmmyy hhmmss.ss" [note 1]
hh: NMEA-style hex checksum, always the last field and following the asterisk
Note 1: Only in -e version, only present if GNSS compass is attached and it has a fix (otherwise blank)
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