Searches Flashcards
As a general rule, for small devices such as limpet mines, a ____ safety zone is appropriate
200yard.
The constant change in water pressure increases the opportunity of POIS or Barotrauma during what kind of search?
Vertical Pile Search.
Plotted size of a search will increase based on what?
Amount of time that has passed since the incident.
What search method should be used for evidence recovery dives?
Grid searches.
What is the semi-circle search used for?
Locating small objects.
What search is best used for ZERO visibility to find SMALL objects?
Jack-stay
In many cases, a lost object recovery is a ____ ____ item that must be recovered without attracting public attention.
High value item
What two reasons should a grid search be used?
Evidence recovery or when precise location date is required.
When conducting or planning a search, modifiers include what?
Strong currents or large surface areas that are more readily affected by current.
Line used for circle searches should be ______ or less?
50ft
Level of inspection to be used is usually determined in the _______ phase?
Planning
What type of search is preferred in moderate current?
Creeping line search
What is the most expedited search?
Towed search
How many buoys does it take to complete a grid search?
At least 8.
What is considered the most effective utilization of divers in ships bottom searches?
Buddy pair jackstay.
How many grids must be in place before beginning a grid search?
At least 2 minimum.
What computations determined the size and distance of a search?
Time, distance, and speed given the measured current.
When must a towline be hand tended during a tow search?
When line pull signals are used.
When the advance team speaks with the witnesses, they should use _______ interview technique.
Standard.
While interviewing the witnesses, the team leader should segregate them and not let them talk amongst themselves. (T/F)
TRUE
Strongly negative buoyant items will most likely be located where?
Near the observed position.
What are the 7 most common lost object search techniques?
Circle/Semi-circle; Jackstay; Grid/modified grid; in-line search; expanding square; parallel or creeping line search; towed search.
Divers should always be assigned a particular area to search. After it has been searched, the area must be ______ and on a chart to avoid searching it again.
Marked with a buoy.
What is the importance of maintaining a dive log during evidence recovery dives?
If search is in support of law enforcement, the diver may be required to testify.
Grid searches are ideal to find what?
Objects less than 1 cubic feet.
What are the different kinds of free swimming search?
Expanding square, parallel, creeping line.
Circle of Probable Error modifies probable search zones by creating what?
A circle of probable error with it’s center point on the current line.
Where should interviews of witnesses be conducted?
At the scene of the incident.
What search can be used in LOW VIS to find small to medium objects?
In-line search.
What is the prescribed size for an in-line search?
50yards x 25 yards
What is needed to perform a circle search?
Clump, buoy, weighted index line, search line on reel/h board.
What should all UHDs be assumed to have?
Timers
Whats the slowest and most thorough search?
Grid search.
What length of line is usually too long for searches?
50’
What 4 things from the incident site should personnel use to focus on interviews?
Incident report, any maps, photographs, or sketches.
Whats the first question to ask witnesses?
How was an object lost? From a vessel, shore, during water crossing exercise?
If lost from a vessel, what was their position, speed, course, and bearing.
In searches, what is CPE?
Circle of probable error.
What could be essential to success prior to a search?
rehearsals and dirt dives.
Minimum distance from Sonar activity
Hooded/Unhooded/Helmeted.
Hooded (3/16”) 600y
Unhooded: 1000y
Helmeted: 3000 yards
Loops or carbines are spaced every ____ ft on a modified necklace search?
5 ft.
How large is the buoy diameter in a necklace search?
11 inches.
Maximum jackstay length on a vessel hull is _____ft.
200ft
