OBS SURVEY, 2019 Seismic data acquisition using RV "G.O. SARS"				UNIVERSITY OF BERGEN Department of Earth Science Allé gt. 41, N-5007 Bergen, Norway

0.1	DRAFT - request for comments	-	8 January, 2019	OM	-	-
VER.	STATUS	CHANGE	DATE	BY	CKD	APPD

INTRODUCTION

Preliminary information:

Survey start: Tuesday 23 July, 2019 / Tromsø
Survey end: Tuesday 6 August, 2019 / Tromsø

SURVEY VESSEL: RV "G.O. SARS"

VESSEL INFORMATION

Institute of Marine Research, RV "G.O. Sars" web page

Phone (via satellite):
- (+47) 5590 6440 (Bridge)
- (+47) 5590 6443 (Mess)
Mobile (bridge): (+47) ----
Call sign: LMEL
To reach the vessel via VHF radio:
As of January 2018, there are two locations, covering Northern Norway (Bodø) and Southern Norway (Sola)
Ask for RV "G. O. Sars", stating vessel call sign LMEL.
- Northern region is covered by "Kystradio Nord": Tel: 120 / 7552 8925
- Southern region covered by "Kystradio Sør": Tel: 120 / 5169 0044

Current position:

SailWX: G.O. Sars
If AIS coverage: Marine Traffic: G.O. Sars

INSTRUMENTATION - OVERVIEW

#	Description
1	Ocean Bottom seismographs: Hokkaido University, Department of Earth and Planetary Sciences (Polish university ?)
2	Gravitymeter
3	Magnetometer
4	Mini-streamer, incl recording system
5	Acoustic source, incl control / monitoring systems (see separate section below)
6	Survey Computer / software: EIVA NaviPac

ACOUSTIC SOURCE, INCL. CONTROL / MONITORING SYSTEMS

#	Description
1	Compressor LMF (permanently installed in G.O. SARS)
2	Airguns: Qty: 4 ea Type: Bolt mod 1600LL Volume: Each (x) cu-inch, total: (Y) Total volume: Nominal firing pressure: 138 Bar (2000 PSI) Deviation from firing time before error flagged: +/- 2 ms
3	Pressure sensor / display unit
4	Airgun Controller (GUNCO) Primary: Teledyne ShotPro Backup: Geco Gunco, including Sync Unit
5	Time stamping of airgun shots

OCEAN BOTTOM SEISMOGRAPHS

DAT tape for Japanese OBS recorders

Requirement	12 ea Sony DAT tapes, either model 'SONY DGD120P' or 'DGD120M
Procured, as of January 2019	3 x 5 ea SONY DGD120M "DDS DATA CARTRIDGE"

Background information:

Description of DDS (Digital Data Storage) data storage media: "...the capacity of LTO has far exceeded that of the most recent DDS standard, DDS-320. " So it seems LTO = Linear Tape-Open - with standard form-factor of LTO technology called "Ultrium" - now dominates data storage media market - "The eighth generation of LTO Ultrium was released in 2017 and can hold 12 TB in a cartridge."

SONY DGD120P:

Sony DGD120P information -- Specifications:
- Recording Standard: DDS-2
- Native Capacity: 4 GB
- Compressed Capacity: 8 GB
Sony DGD120P Digital Data Storage Cartridge 4/8 GB (Discontinued by Manufacturer) --- but does not ship to Norway - price indication: USD 7,50 / ea

SONY DGD120M:

Specifications:
- Recording Standard: DDS-2
- Native Capacity: 4 GB
- Compressed Capacity: 8 GB
SONY DGD120M DAT 4/8GB DDS-2 DATA CARTRIDGE --- does not ship to Norway ---- USD 4.35/ea

POSSIBLE SUPPLIERS:

Wave Technologies AS Tel: (+47) 73 19 20 00
Advania
Senetic

DETTE MÅ UNDERSØKES

EIVA Survey Computer, som styrer skudd-posisjoner og endel av data-loggingen
1. Hvordan er tilstanden på datamaskin hardware?
2. Status på RS-232 extension enhet, som må være installert i EIVA-maskinen ?
3. Hva er status på EIVA NaviPAC software ?
4. Vil det være HI-instrumentpersonell ombord under toktet, som kan betjene EIVA NaviPac software ?
5. Vil vil trolig ta med en ny Airgun Controller (GUNCO) denne gangen: Teledyne HotShot - men muligens ha med den gamle typen som reserve. Vi må undersøke hvordan ny type GUNCO skal ha interface mot Survey Computer'n.
GRAVITYMETER
1. Gravimeter-rommet 2.dekk pleier (naturlig nok) å bli brukt som lagerplass når ikke gravimeteret er ombord. Rommet må ryddes før toktstart.
2. Er serielinjen fra gravimetrrom opp til seismikk-lab 5. dekk, intakt ?

MISC

Verif-i SG Ltd.: GPS Synchroniser --- "Record event times with microsecond precision"