Slogger Raw Data NMEA 0183 Format

This page defines the format of the serial data stream sent by the Slogger system. The data is in the National Marine Electronics Association's NMEA 0183 Standard for Interfacing Marine Electronic Navigational Devices. $P type proprietary sentences are used to transfer data which does not fall within the scope of approved NMEA 0183 sentences.

Transmission Specs

Record Format

The Slogger system acquires data from serial, analog, and frequency devices, computing a mean, minimum, and maximum sample value for each input over the period of a minute. It then broadcasts this data out a serial port in the herein defined format. Below is a sample slogger data stream. As can be seen, each data record is bound with the proprietary coded items $PSTA and $PEND. All data in these bounds was acquired during the same time interval. 

$PSTA, <'record count'>     /* Start of Slogger record */
$ZCZDA, <'data'>            /* sample time and date */
$TRGLL, <'data'>            /* SatNav Data */
$TRVTG, <'data'>
$TRTRF, <'data'>
$LCGLL, <'data'>            /* LORAN-C Data */
$LCGTD, <'data'>
$LCSBK, <'data'>
$LCSCY, <'data'>
$LCSNU, <'data'>
$LCVTG, <'data'>
$LCZLZ, <'data'>
$GPGGA, <'data'>            /* GPS Data */
$GPVTG, <'data'>
$GPGLL, <'data'>            /* GPS 10 scan average */
$GPGFF, <'data'>            /* GPS crystal clock */
$WISTN, 01                  /* Start of MET A */
<'data'>                    /* Raw data from MET A Computer */
$WISTN, 99                  /* End of MET A */
$WISTN, 02                  /* Start of MET B */
<'data'>                    /* Raw data from MET B Computer */
$WISTN, 99                  /* End of MET B */
$WISTN, 03                  /* Start of MET C */
<'data'>                    /* Raw data from MET C Computer */
$WISTN, 99                  /* End of MET C */
$HEHDT, <'data'>            /* Gyro Data */
$VDVBW, <'data'>            /* Speed Log Data */
$PRAWA2D, W011, <'data'>    /* Port wind speed data */
$PRAWA2D, W012, <'data'>    /* Port wind heading data */
$PRAWA2D, W021, <'data'>    /* Stbd wind speed data */
$PRAWA2D, W022, <'data'>    /* Stbd wind heading data */
$PRAWA2D, F011, <'data'>    /* Fluorometer Signal Data */
$PRAWA2D, F012, <'data'>    /* Fluorometer Range Data */
$PRAWFREQ, L011, <'data'>   /* SST Data */
$PRAWFREQ, T011, <'data'>   /* Flow Thru SST Data */
$PRAWFREQ, C011, <'data'>   /* Flow Thru Conductivity Data */
$PEND, <'record number'>    /* End of Slogger Data Set */
Note: The output from the MET systems is expected to be already in NMEA 0183 format.

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