Wide Area Search Overview

The Wide Area Search operation is a technique that can be used to find an object or clear an area to ensure an object is not there, or map an area. The purpose for this procedure is to maximize the chances of success and ensure that the entire area is systematically searched so there is no question that the entire area has been completely observed or inspected.

The recommendations for this SOP come from some of the world's leading experts in the field and have been formulated after many hours of field experience. However, they should be considered a starting point since every possible scenario cannot be anticipated. Be prepared to make adjustments and fine tune the settings to adapt these recommendations to your specific circumstances and environment.

General Concept

The Wide Area Search operation consists of creating a well-defined search pattern and making sure the ROV adheres to the pattern while the operator makes observations consistent with the objectives. This pattern is typically a form of "mowing the lawn" by running parallel transects within a defined perimeter. The optimal pattern usually minimizes the number of turns and ensures full coverage of the area by using overlapping transects. The amount of separation of transects has to be small enough to ensure adequate video or sensor coverage (thus assuring no gaps), but not too small to result in redundant passes.

Applicability

The Wide Area Search operation is applicable in open water locations. There are several scenarios that might warrant the use of the Wide Area Search SOP:

1. The first scenario is where the ROV is being used to locate an object and either record video or sensor data or retrieve the object. The location of the object may be known precisely or only the general vicinity of the object may be known and even that may be with a large amount of uncertainty. This scenario might apply to a search and recovery of a drowning victim, or relocation of an object that was placed previously or accidentally dropped, or where an object has been detected by some other means such as side scan sonar and the objective is to identify the object using video or sensors.

2. The second scenario is to ensure that an object is not in a specific area. This scenario would apply to a threat assessment where the objective is to ensure that no threats exist within a defined perimeter and ensure that the entire enclosed area has been cleared.

3. The third scenario is to create an understanding of an area, which may include mapping physical or biological parameters. This can range from a simple survey to a more complex and comprehensive study.

4. The fourth scenario is to monitor a specific area and perform a change detection analysis on a regular basis. This is often applied to the second or third scenarios.

Prerequisites

Participants in a Wide Area Search should be familiar with operating a VideoRay Defender running the EOD Workspace control system. For more information about these products, see the MSS Manuals compilation.