User`s manual

Section 3: Configure Menu, Part I - General System Setup
20
NMEA Lat/Lon Interface
If your instrument is connected to a deck unit that can integrate data from a
NMEA navigation device with the CTD data, NMEA Lat/Lon Interface
defines what navigation data is written to the data file. Note that NMEA data
is written to the data file only if the instrument configuration (.con) file
indicates that NMEA data is to be added (see Section 4: Configure Menu,
Part II - Instrument .con File).
To set up the NMEA Interface:
1. In the Configure menu, set up the CTD configuration (.con) file as desired
(see Section 4: Configure Menu, Part II - Instrument .con File).
Select NMEA data added in the instrument Configuration dialog box.
Save the changes.
2. In the Configure menu, select NMEA Lat/Lon Interface. The NMEA
Interface Configuration dialog box appears.
Select how to store the data:
• Add to Header Only: Latitude, longitude, and time are automatically
written to the header when data acquisition is started.
• Append to Every Scan: Latitude, longitude, and time are
automatically written to the header when data acquisition is started.
Additionally, 7 bytes of Lat/Lon data are appended to every scan of
CTD data.
Note: For the SBE 21, if NMEA depth data added is selected in the
.con file, 3 bytes of depth data is also appended to every scan of CTD
data, after the Lat/Lon data.
• Append to .nav File when <Ctrl F7> is Pressed: Latitude,
longitude, and time are automatically written to the header when data
acquisition is started. And, latitude, longitude, time, scan number, and
pressure are written to a .nav file every time Add to .nav File is
selected (see Adding NMEA Data to .nav File in Section 7: Real-Time
Data Acquisition).
• Append to Every Scan and Append to .nav File when <Ctrl F7> is
Pressed: Latitude, longitude, and time are automatically written to
the header when data acquisition is started. Additionally, 7 bytes of
Lat/Lon data are appended to every scan of CTD data. And, latitude,
longitude, time, scan number, and pressure are written to a .nav file
every time Add to .nav File is selected (see Adding NMEA Data to
.nav File in Section 7: Real-Time Data Acquisition).
Note: For the SBE 21, if NMEA depth data added is selected in the
.con file, 3 bytes of depth data is also appended to every scan of CTD
data, after the Lat/Lon data.
Click OK.
Note:
When running Data
Conversion in SBE Data
Processing, if a .nav file is
found in the same directory as
the data file (and with the
same name), the contents of
the .nav file are added to the
converted data file header.
Notes:
• There can be up to two
date/time listings in the header.
The first, System Upload Time,
is always the date and time
from the computer. The second,
UTC Time, is the date and time
from an optional NMEA
navigation device.
• NMEA Lat/Lon Interface
selections are not applicable to
the SBE 45. The 90402 –
SBE 45 Interface Box defines
what navigation data is included
in the data file.