NBP09-01 Cruise Report - British Oceanographic Data Centre

Figure 17: Using small boat for recovery.hand, via a sheave mounted on the ship’s rail, to a depth of about 80m (100m of cable, from the exit point ofthe work space). The deck unit and controlling laptop (Toshiba) were housed in the aft control cabin. Thelaptop was used to run the NOCS ”beaconview” program. Initial electrical noise problems were traced to afault in the sea cable producing a ground loop fault. After repair (see fault log) good ranges were obtained,limited only by the acoustic noise from the ship.LinkQuest digital telemetry systemAutosub carries a LinkQuest Tracklink modem and transponder, which is used to track and command thesub when underwater, and to receive a limited subset of digital data. The LinkQuest worked well at rangesof up to 2-3km, although the tracking display, which was repeated on a monitor on the bridge, was onlyavailable in head-up mode.ORE LXT acoustic transponderThis transponder (also known as the ”dumb” transponder) is used for tracking, as a backup for the LinkQuest.The LXT worked well, tracking the sub to a similar range as the LinkQuest.NBP09-01 Cruise Report (p. 21 of 83) Revised February 27, 2009