Accession Number:

AD0600305

Title:

STRUCTURES IN DEEP OCEAN: ENGINEERING MANUAL FOR UNDERWATER CONSTRUCTION. CHAPTER 3. RECONNAISSANCE AND POSITIONING.

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s):

Report Date:

1964-03-15

Pagination or Media Count:

236.0

Abstract:

The chief factors involved in reconnaissance and positioning for a deep-ocean construction site are described in this report. In determining surface position from landfall, the two chief methods are the optical sextant-angle fix and the electromagnetic methods. Electromagnetic methods involve radar and other techniques such as the Tellurometer, Raydist, and Geodimeter. In determining position from a point out of sight of land, celestial navigation is the general measurement. Electromagnetic techniques, such as Shoran and Loran, are effective for long-range accuracy distances between 50 and 1400 miles. LORAC is considered to be one of the most accurate long-range 500 miles or greater positioning systems. Maintaining a position relative to an underwater construction site represents a major problem to the constructor. Factors involved include that o a suitable mooring system. Conventional anchor cable systems are commonly used for depths less than 6,000 feet. For greater depths, the U. S. Navy Bureau of Yards and Docks has devised a special deep-sea mooring system.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE