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Search & Recovery Lecture 5 Search Methods

Search & Recovery Lecture 5 Search Methods. We Will Cover. Search essentials Research Stage Types Of Search Bottom line search Circular search. We Will Cover. Jackstay search Grid search Compass search Single diver search R.O.V use D.P.V use. Search Essentials.

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Search & Recovery Lecture 5 Search Methods

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  1. Search & Recovery Lecture 5Search Methods

  2. We Will Cover • Search essentials • Research Stage • Types Of Search • Bottom line search • Circular search

  3. We Will Cover • Jackstay search • Grid search • Compass search • Single diver search • R.O.V use • D.P.V use

  4. Search Essentials • Aim for 100% coverage • Method should be simple + effective • Teamwork is essential • Team must be adaptable if chosen method becomes unworkable • Cost effective – in dive time

  5. Research Stage • Important to research and plan well before diving • An exact search area greatly enhances the chances of recovery

  6. Types of Search • Search Method choice will depend on: • Water movement • Visibility • Equipment available • Numbers of divers available • Depth • Type of Seabed/ Riverbed

  7. Swim Line Search • Canals / rivers using bank as limiter • In open sea using parallel jackstays • ‘Anchor diver’ at both ends keep line taut • Can be conducted from shore (no boat) • Swimming with current will save energy • Swimming against the current will be more arduous , but may improve visibility

  8. Bottom Line Search • Quick coverage of large area • Uses many divers (2-8) • Difficult to control, if not practised • Distance between divers depends on visibility • Too much distance between divers reduces effectiveness

  9. Bottom Line Search

  10. Tow Search • Can be useful for large areas • Needs experienced divers and cox’n • Very slow speeds when towing divers

  11. Circular Search • Where search area is small • Diver(s) circle(s) around weighted shot-line • Diver uses reel from central shot • Fixed bottom line indicates full circle completed • No special equipment required

  12. Circular Search

  13. Jackstay Search • For small objects • Restricted area • Good coverage • Takes time • Bad weather hampers • Equipment required • Practice needed

  14. Shotweight Shotweight Jackstay line Jackstay Search

  15. Jackstay and Parallel Baselines Search

  16. Grid Search • For finding small items • In very small areas • 100% coverage possible • Need lots of time • Labour intensive

  17. Compass • For large object • Good navigation skills • Good visibility • Slack water • Practice needed

  18. Single Diver Search • Easy to commence • Ideal for search such as river-bank • Fast flows / bad visibility • Communications / standby diver • Safety lines / harness • Experienced personnel • Safety

  19. Single Diver Search

  20. R.O.V • May be an option in cold or deep water if available

  21. R.O.V • Requires specialist training

  22. Diver Propulsion Vehicle • May be useful for large areas with good visibility • Divers need to be competent in their use

  23. Search Methods • Record all areas searched to avoid duplication • Ensure 100% Coverage Good luck everybody !

  24. Summary • Search essentials & Research Stage • Types Of Search • Bottom line search • Circular search & Jackstay search • Grid search & Compass search • Single diver search • R.O.V use & D.P.V use

  25. Questions?

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