(2025 Exam) USN SALV MAN VOl 4 Ch2 Flashcards
VOLUME 4 (DEEP OCEAN OPERATIONS)
What is the swath range of the side scan sonar?
50 meters to more than 2,000 meters
One of the most common range overlaps used in a search by side-scan sonar is __ %.
50%
Lifts can be accomplished by what three basic methods:
vehicle lifts, buoyant lifts and synthetic line lifts.
What is the FADOSS
Fly Away Deep Ocean Salvage System.
The FADOSS prevents snap loading and reduces dynamic loading to _____% of the nominal static load when deploying or lifting loads.
10%
What is Datum?
A fixed starting point?
How much area is considered excellent datum accuracy?
less than 1 square nautical mile
What a Echo-Sounder Transducer made from and what does it do?
Its made from a ceramic device that converts acoustic energy into electrical energy and vice versa)
What is the main value from a echo-sounder during a search?
The continuous seafloor topography data it produces.
What is generally considered the single most effective tool for underwater search?
Side-Scan sonar.
Flight data recorders used by military and commercial aircraft have a ___kHz acoustic pinger to aid in their location in case of a crash at sea?
37 KHz
What are two types of towed Pinger-locators? And how do they differ?
Omnidirectional- max detection range of one mile, cannot give bearing info.
Tuned array- has narrow directional hydrophone (+- 15degrees) max detect 2 miles.
What is one of the only tools capable of locating an object buried deeply in bottom sediments?
Magnetometers
What are the three types of Towed sensor search patterns?
Parallel Grid search- Most common.
Constant range search- Used when tow vessel doesn’t have means of keeping a straight line.
“Z” search- Used for pipelines or cables.
ROV’s use what type of search?
Box Search
