Yno 226 - Western Legend

Yard no 226 built 1991 by Ulstein Verft AS, Norway for Western Atlas International Inc., Houston, USA

Yno 226 Western Legend

The vessel is designed by Ulstein International AS in close cooperation with Western Geophysical, and is executed by Ulstein Verft AS as yard no. 226. The UT 743 design is developed in accordance with the demanding requirements for silent operation at high capacity rements for silent operation at high capacity production. The vessel features a compact and efficient layout, providing a comprehensive arrangement of mechanical and electronic seismic outfitting, and a highly flexible, redundant and powerful propulsion and machinery package.


The vessel is built to Det norske Veritas Class + 1A!, ICE-C, E0, HELDK, and to international rules and regulations as applicable for the subject type of vessel. Further the vessel satisfies IMO Res. A.468 (XII) as a general maximum noise level, with additional reduction of noise level in laboratories and related reduction areas. Special consideration has been taken from design stage and throug out the building program in order to minimise hydroacoustic noise generated by the vessel.

Other names: "Marcus G. Langset"

2004: Renamed "Marcus G. Langset"
2017: Still active - IMO 9010137. Owner: National Science Foundation Alaska, Seward AK, USA. Manager: Columbia University, New York NY, USA. Flag: New York NY, USA


Length over all: 71,5 m 
Length between p.p: 61,2 m 
Breadth, moulded: 17,0 m 
Depth Main Deck: 7,6 m 
Design draught: 5,4 m 
Scantling draught: 5,9 m


Gross Tonnage 1969) below: 3000 GRT 
DW (5,9 m) approx.: 1950 tonnes 
DW (5,4 m) approx.: 1500 tonnes 
Fuel oil (Ex.sys.tks.) approx.: 1230 m3 
WB approx.: 920 m3 
FW approx.: 230 m3 
Cable oil, clean oil: 20 m3 
Cable oil, dirty oil: 20 m3 
Work deck area (Main deck): 740 m2 ((8000 sq.ft)
Recording room area: 200 m2 
Helideck: CAA/DnV. AS 332 Super Pumpa


Accomodation 48 persons in total, of which: 
- 5 suits with dayroom, bedroom and bathroom 
- 5 two-man cabines 
- 16 two-man bedrooms attached to dayrooms 
- 1 two-bed hospital


Trial Speed (4,5 m): 15,7 knots 
Design pull, 5 kn. 30 tonnes 
Max. pull, 5 kn: 50 tonnes


Bergen Diesel, main engines 2 x BD 32 M6 each of 3300 BHP at 750 rpm 
Ulstein Propeller Twin Screw propulsion, comprising: 2x1500 AGSC controllable pitch propulsion plants, each with: Low noise 
4-bladed scewed CP-propeller, driven through a reduction gearbox with two-speed PTO for shaft generator
Ulstein Propeller, bow thruster: 150 TV, 800 Hp, el. driven
Ulstein high lift rudders: 2 off 
Shaft generator 2 x 1665 kVA, 450 V, 60 Hz 
Aux.generator: 1 x 900 kVA, 450 V, 60Hz driven by one Cummins KTA 38 G1 diesel engine, rated at 1030 HP at 1800 rpm 
Clean power: 2 x 78 kVA, 230 V, 60 Hz 
Air compressors: 2 x Eureka / Ariel 2725, 2725 SCFM, 2000 psi, driven by Caterpillar 3516 Diesel engine


2 x 48 person Enclosed 
Life rafts As per Solas
MOB boat 1 x Seabear 23, with inboard diesel. Crane deployed
Work boat 1 x Seabear 23, with inboard diesel. Davit deployed
Norwinch Windlass: Type AV-33/38-36 K3
Ulstein Marine Electronics: Switchboards
- Electronic remote control system. Main Propeller (PROCON) 
- Joystick control system (POSCON) 
- Electronic remote control system. Bow thruster (SITCON) 
- Bridge control consoles 
- Engine room console 
- Starters (for el. motor) 
- El. test board 
- Engine room telegraph 
- Microprocessor based alarm system (with dead man system and printers)


Radar: Furuno FAR-2822, XBand ARPA-, 120 NM Rang x-band (3 cm), ARPA, 72 miles
Radar: Furuno FAR 28305, SBand ARPA 96 NM Range
Inmarsat: JRC JVE 45A MKII Voice/Telex/Fax 
Radio (to FMDSS Requirements). Skanti TRP8150DS Duplex SSB MF / HF, 750 watt 
Skanti TT3200 Radio Telex System 
Skanti RS7100DX VHF Duplex (2) 
Skanti VHF Simplex (1) 
Skanti TR6102 Ground to Aircraft (AM/VHF) 
Panasonic 450 MHZ Cellular Telephone 
Skips Navigation: Tokyo Keiko Gyrocompass System 
Robertson AP9 MKII Autopilot 
Furuno FSN-50 Transit Satelite RCVR 
Furuno GP500 GPS Satelite RCVR 
Furuno LC 90 MKII Loran CRCVR 
Furuno FD 525 VHF Direction Finder 
Furuno TDC-318 mF/HF Direction Finder 
Furuno FE 680 Echo Sounder - Range to 2100 metres 
Furuno Fax 208A Weather facsimile RCVR Ben Marine 
Electronmagnetic Log 
Trane & Trane standard C Inmarsat (telex)