Page 



NAVIGATIONAL HINTS (Continued) 



Fix Reliability 27 



Special Case 28 



Compass Alignment 28 



Mechanical Defects 28 



Retained Magnetism 28 



Local Magfnetic Disturbance 28 



Radio Direction Finders 29 



Sound Signal Caution 29 



Radar Landfall 29 



Iceberg Detection 30 



Pin Point Anchoring 30 



Conclusion 31 



FISHERIES VESSELS AND GEAR 



Classes and Methods 33 



Food Cycle 33 



Trawlers 33 



Pareja Trawling 35 



Long-Line Fishing 35 



Drifters 36 



Purse Seines 37 



Madi Valai 37 



Shrimp Fisheries 38 



Tunas 38 



Tunnymen 38 



Salmon 39 



Weirs, Pound Nets, and Traps 39 



Oysters 40 



Lobster Fisheries 40 



Conclusion 40 



SHIPS-OF-OPPORTUNITY 



Born of Necessity 42 



Not a New Idea 42 



ASWEPS 42 



The Near Surface Reference Temperature System 44 



Project Neptune 45 



Discussion 46 



Conclusion 48 



OCEAN STATION VESSELS 



Meteorological Service 49 



Oceanographic Data Collection 50 



Navigational Aids 50 



Search and Rescue 52 



Operations 53 



Atlantic— History 54 



Pacific — History 55 



Support 56 



VI 



