User`s manual

Section 7: Real-Time Data Acquisition
69
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 from a Thermosalinograph taken at the
same time, or to 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 Mark Variable Selection in the Configure menu (see Mark Variable
Selection in Section 3: Configure Menu, Part I - General System Setup).
2. Start real-time data acquisition.
3. In the View menu, select Mark Scan. The Mark Scan Control dialog
box appears.
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 Data Display allows you to view the latitude, longitude, and time
during data acquisition, and to select scans to be written to a .nav file, if the
NMEA Lat/Lon Interface has been set up. Each scan written to the .nav file
contains latitude, longitude, time, scan number, and pressure.
To add data to a .nav file:
1. Set up the NMEA Interface in the Configure menu (see NMEA Lat/Lon
Interface in Section 3: Configure Menu, Part I - General System Setup).
2. Start real-time data acquisition.
3. In the View menu, select NMEA Data Display. The NMEA Data dialog
box appears.
4. When desired, click Add to .nav File.
Note:
The .mrk file has the same file
name and is placed in the
same directory as the data file.
For example, if the data file
is test1.hex, the .mrk file
is test1.mrk.
Note:
If desired, you can mark scans
without using the Mark Scan
Control dialog box. Each time you
want to mark a scan, select Mark
Scan in the RealTimeData menu,
or press Ctrl F5.
Note:
The .nav file has the same file
name and is placed in the
same directory as the data file.
For example, if the data file
is test1.hex, the .nav file
is test1.nav.
Note:
If desired, you can add data to
the .nav file without using the
NMEA Data dialog box. Each time
you want to add data, select Add
to .nav File in the RealTimeData
menu, or press Ctrl F7.