Surface sightings:


Date: 1954
Investigators: Captain Donald MacLean & Mate Peter Anderson
Type of Equipment: Messrs. Kelvin & Hughes, Marine Echo Sounder
Type of Experiment: Peterhead drifter Rival III; ordinary depth sounding
Significant Results: Inconclusive

-------------------------------------------------------------------​-------------
Date: 1960 to 1972
Investigators: Miscellaneous vessels passing through Loch Ness
Type of Equipment: Depth recorders of various manufacturers
Type of Experiment: Ordinary depth sounding
Significant Results: Inconclusive

-------------------------------------------------------------------​-------------
Date: 1960 June to July
Investigators: Dr Peter F Baker & Mark Westwood
Type of Equipment: Basdic Frequency 38kHz
Type of Experiment: Preliminary survey
Significant Results: None

---------------------------------------------------------------------------​-----
Date: 1961
Investigators: Birmingham University Loch Ness Expedition
Type of Equipment: No Information
Type of Experiment: Vertical echo sounding from surface
Significant Results: None

---------------------------------------------------------------------------​-----
Date: 1962 July to August
Investigators: Oxford and Cambridge Loch Ness Expedition, Dr Peter F Baker and team
Type of Equipment: Three Basdic Units (Simrad of Oslo, Norway) Frequency 28kHz
Type of Experiment: A. Single moving craft traverse B. Shore-based sonar gate C. Moving sonar curtain
Significant Results: Inconclusive (possibly none)

--------------------------------------------------------------------------​------
Date: 1968 April
Investigators: Birmingham University, Prof D Gordon Tucker, Dr Hugh Braithwaite, Dr D J Creasy and team
Type of Equipment: Digital Sonar developed by Birmingham University. Frequency 50kHz
Type of Experiment: Fixed sonar screen, shore-based
Significant Results: Positive

-----------------------------------------------------------------------​---------
Date: 1968 August
Investigators: Same Birmingham Team
Type of Equipment: Digital Sonar developed by Birmingham University. Frequency 50kHz
Type of Experiment: Fixed sonar screen, shore-based
Significant Results: Positive

-----------------------------------------------------------------------​---------
Date: 1969
Investigators: Same Birmingham Team, except cooperation with Plessey Ltd. team
Type of Equipment: Digital Sonar developed by Birmingham University. Frequency 50kHz
Type of Experiment: Fixed sonar, shore-based
Significant Results: None

---------------------------------------------------------------------------​-----
Date:1969 June to August
Investigators: Vickers, Ltd., R W Eastaugh and team
Type of Equipment: Western Marine Electronics SS100; Frequency 155kHz
Type of Experiment: Mobile mode, sonar aboard Pisces submarine
Significant Results: Positive

-----------------------------------------------------------------------​---------
Date: 1969 May
Investigators: LNIB Ltd., Major Eustace Maxwell, David James, Lord Richard Percy, Dr Ian Lyster
Type of Equipment: Marconi Depth Sounder Raytheon Model 729 Fathometer; Seascribe Depth Finder
Type of Experiment: Drifter Penorva mobile mode from surface craft
Significant Results: None

---------------------------------------------------------------------------​-----
Date: 1969 September
Investigators: Independant Television (ITN) sponsorship. Plessey Ltd. (in cooperation with Birmingham Tucker Team)
Type of Equipment: Plessey Model 195; Frequency 10kHz
Type of Experiment: Stationary vessel in middle of Loch; 5 kilowatts of audible sonic energy projected
Significant Results: None

---------------------------------------------------------------------------​-----
Date: 1969 September to October
Investigators: World Book Encyclopaedia Griffis Foundation, LNIB Ltd., Robert Love & team, Captain Don Boddington
Type of Equipment: Honeywell Scanar II; Frequency 100kHz
Type of Experiment: Mobile search mode made from surface vessel Rangitea
Significant Results: Positive

-----------------------------------------------------------------------​---------
Date: 1970 September
Investigators: Birmingham University Prof D Gordon Tucker, Dr Hugh Braithwaite, Dr D J Creasy and team
Type of Equipment: Digital Sonar developed by Birmingham University; Frequency 50kHz
Type of Experiment: Fixed sonar screen, shore-based
Significant Results: Positive results not published

----------------------------------------------------------------------​----------
Date: 1970 August to November
Investigators: World Book Encyclopaedia, Carl Byoir and Associates, LNIB Ltd., Robert Love and team, Captain James Skinner
Type of Equipment: Honeywell II; Frequency 100kHz
Type of Experiment: Mobile search mode made from surface vessel Rangitea
Significant Results: Positive

-----------------------------------------------------------------------​---------
Date: 1970 September
Investigators: Academy of Applied Science, Robert Rines, Martin Klein and team
Type of Equipment: Klein Associates Model MK - 300 Side Scan; Frequency 50kHz
Type of Experiment:A. Fixed mode from shore-base B. Towed mode from surface craft
Significant Results: Both Positive

-----------------------------------------------------------------------​---------
Date: 1972 August
Investigators: Academy of Applied Science, Robert Rines and Team
Type of Equipment: Raytheon Depth Finder Model DE - 725C; Frequency 200kHz
Type of Experiment: Fixed surface operation
Significant Results: Positive