xv
3.13 Towfish Deployment ................................................................................................................ 3-21
3.14 Towfish Recovery ..................................................................................................................... 3-23
4.0 MAINTENANCE ......................................................................................................................4-1
4.1 Cleaning the 4125 System ......................................................................................................... 4-1
4.1.1 Inspecting and Cleaning the Connections ............................................................................ 4-1
4.2 Re-arming the Towfish............................................................................................................... 4-2
5.0 TROUBLESHOOTING ...............................................................................................................5-1
5.1 Restoring the Operating System to the Hard Drive ................................................................... 5-1
5.2 Disassembling and Reassembling the Towfish .......................................................................... 5-1
5.2.1 Disassembly .......................................................................................................................... 5-1
5.2.2 Reassembly ........................................................................................................................... 5-5
5.3 Calibrating the Compass ............................................................................................................ 5-5
5.3.1 Changing the Angle of Declination ..................................................................................... 5-14
5.4 General Troubleshooting ......................................................................................................... 5-18
5.5 4125-P Portable Topside Processor Troubleshooting ............................................................. 5-19
5.6 4125 Towfish Troubleshooting ................................................................................................ 5-19
5.7 Tow Cable Inspection............................................................................................................... 5-21
5.7.1 Locating a Shorted Conductor ............................................................................................ 5-22
5.7.2 Locating an Open Conductor .............................................................................................. 5-22
5.7.3 Locating a Resistance Breakdown ...................................................................................... 5-23
5.7.4 Damaged Tow Cable Connector ......................................................................................... 5-23
5.8 Part Numbers for Major Topside Components ....................................................................... 5-23
5.9 Part Numbers for Major Towfish Components ....................................................................... 5-24
A.0 SYSTEM RESTORE ................................................................................................................ A-1
B.0 PRINTERS ............................................................................................................................ B-1
C.0 TOWING CHARACTERISTICS ................................................................................................. C-1
C.1 4125 Towfish Cable Layback Plots ............................................................................................. C-1
C.1.1 Config. 2: 4125, 23080 Cable - 100m Long ........................................................................... C-6
C.1.2 Config. 4: 4125, 23080 Cable - 300m Long ........................................................................... C-7
C.1.3 Config. 6: 4125 + 15 lb. Keel Weight, 23080 Cable - 100m Long .......................................... C-8
C.1.4 Config. 8: 4125 + 15 lb. Keel Weight, 23080 Cable - 300m Long .......................................... C-9
C.1.5 Config. 10: 4125 + Depressor Wing, 23080 Cable - 100m Long ......................................... C-10
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