Electronic techniques and devices for planned relocation of equipment in shallow water (to 30 fathoms)

The question is asked "Why is equipment still being lost in shallow water?" A tentative answer is given that users expect both too much and too little from existing electronic relocation devices and techniques. These expectations are discussed through a review of the types of electronic devices and techniques now commercially available. Included are discussions of active and passive sonar systems (diver-held and shipboard) as well as visual, magnetic, and radio frequency aids. Exploration of the status of frequency standardization in selected mission equipment will be briefly mentioned. The role of the computer in devising search patterns and in estimating relocation probabilities is also noted. Selected case histories of both successful and unsuccessful shallow water relocation operations are presented to illustrate problem areas and potential solutions. A projection is made of future applications in which relocation of equipment in shallow water will become increasingly important.