User`s manual

Section 8: Real-Time Data and Real-Time Control - Real-Time Data Acquisition
86
Marking Scans
Mark Scan allows you to copy the most recent scan of data to a mark (.mrk)
file as desired. The .mrk file can be used to manually note water sampler bottle
firings, compare CTD data with data acquired from a Thermosalinograph at
the same time, or mark significant events in the cast (winch problems, large
waves causing ship heave, etc.) for later review and analysis of the data.
If a plot display is set up to Show Mark Lines, SEASAVE also draws a
horizontal line in the plot each time you mark a scan.
To mark scans:
1. Set up the Mark Variables in Configure Outputs (see Mark Variables in
Section 6: Configure Outputs).
2. In the Real-Time Control menu, select Mark Scan. The Mark Scan
Control dialog box appears.
3. Start real-time data acquisition.
4. When desired, click Mark Scan. The dialog box displays how many
scans have been marked (copied to .mrk file).
Adding NMEA Data to .nav File
NMEA Display allows you to view the latitude, longitude, and time during
data acquisition, and to select scans to be written to a .nav file. Each scan
written to the .nav file contains latitude, longitude, time, scan number,
and pressure.
To add data to a .nav file:
1. In the Display menu, select NMEA Display. The NMEA Data dialog
box appears.
2. Start real-time data acquisition.
3. When desired, click Add to .nav File.
Note:
The .mrk file has the same path
and file name as the data file.
For example, if the data file
is c:\test1.hex, the .mrk file
is c:\test1.mrk.
Notes:
• The Mark Scan button in the
Mark Scan Control dialog box
is inaccessible until you start
saving data to a file. So, if you
did not select Store data on
disk (or selected Delay storing
data to disk until Start Archiving
command is sent and did not
yet send the Start Archiving
command), the Mark Scan
button is grayed out.
• If desired, you can mark scans
without using the Mark Scan
Control dialog box. Each time
you want to mark a scan, press
Ctrl F5.
Note:
The .nav file has the same path
and file name as the data file.
For example, if the data file is
c:\test1.hex, the .nav file is
c:\test1.nav.
Notes:
• The Add to .NAV file button in
the NMEA Data dialog box is
inaccessible until you start
saving data to a file. So, if you
did not select Store data on
disk (or selected Delay storing
data to disk until Start Archiving
command is sent and did not
yet send the Start Archiving
command), the Add to .NAV
File button is grayed out.
• If desired, you can add data to
the .nav file without using the
NMEA Data dialog box. Each
time you want to add data,
press Ctrl F7.