Past operations & data
Communications / Navigation / Tracking
Ship contact info
Last update: June 26, 2020, at 08:55 PM
Drawing No. HC-001-E-G-001-1, Rev-A. Click to open PDF version.
RTM3 Trigger interface
From RTM3 manual: RTM3 time stamp trigger input -- G = center coax; R = coax shield. Click to enlarge.
Backup: Installing all software on Win 11 laptop
In order to prepare for future replacement of main seismic computer -- a 2008 vintage Dell Latitude D630 laptop running WinXP -- we attempted to install all software on a modern laptop.
New laptop: Dell Latitude 7420
Installing Python interpreter and three libraries
Install three libraries:
First open terminal window, then use these commands (assuming Python interpreter was installed in default directory, c:\Python27\):
cd c:\Python27 .\python -m pip install -U pip .\python -m pip install pyserial==2.7 .\python -m pip install psutil
Installing GEODE software
Install GNSS/Survey logger, and Mini-GUNCO software, in two new directories
In terminal window:
cd c: mkdir HOVERCRAFT_GPS_2022 mkdir HOVERCRAFT_GUNCO_2022
Run the programs, in separate terminal windows:
Terminal window #1:
cd c:\HOVERCRAFT_GPS_2022 c:\python27\python .\hovercraft-GNSS-ver3-2020-07-13.py
Terminal window #2:
cd c:\HOVERCRAFT_GUNCO_2022 c:\python27\python .\gunco-ver4-2022-07-13.py
13 July, 2022: Three programs operating on WIN11 laptop:
Time stamping of airgun firing
Under consideration: https://verif-i.com/product/gps-sync/
GEODE seismic recorder
USB to serial adapters
SURVEYS 2008 - 2019
We have been using:
Splicing of hydrophone cable
Hydrophones are normally ordered unterminated. In order to splice the hydrophone cable to a suitable underwater pigtail cable (which is delivered with one connector; the other side is open) an inline cable splicing kit must be used:
Interface between hydrophone AQ-18 / 6 ch streamer and GEODE recording system
Click to see large version:
Interface between Teledyne AQ-18 Hydrophone / 6 channel mini-streamer and Geode Recording system - click to see large version.
Recommended AQ-18 decoupling and wiring.
The recommended decoupling is done in the interface box shown below. The interface is also furnished with a DC/DC-converter in order to provide a clean 12 Vdc power source for the hydrophone.
Mini-streamer, 6 channels
GPS for time- and position stamping of data
Configuration for use with UBS based GPS
If a USB based GPS should be used, there is a problem as the Geode software only accepts serial port in the Keep('COM1') to Keep('COM4') range, see screenshot below.
The USB based GPS will normally be assigned to a COM number in a higher range. So a remapping of COM port assignment need to be done.
Geode software serial setup menu.
Default COM port assignment and NMEA telegram output from ordinary USB/GPS shown below.
Data from USB/GPS, default selection of telegrams.
Re-assigning COM port to fall within the 1-4 range is accomplished from Control Panel -> Hardware -> Comport -> (properties of USB/GPS port)
In advanced settings, you can force comport setting to an available number within the 1-4 range that Geode software accepts.
Backup recording system
Ref. notes on this page.