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AIDS TO NAVIGATION
MANUAL -
STRUCTURES
































COMDTINST M16500.25
SEPTEMBER 2004


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Commandant
United States Coast Guard

2100 Second Street, S.W.
Washington, DC 20593-0001
Staff Symbol: G-SEC
Phone: (202) 267-1907
Fax: (202) 267-4788




COMDTINST
M16500.25


OCT 21, 2004
COMMANDANT INSTRUCTION M16500.25

Subj:
AIDS TO NAVIGATION MANUAL - STRUCTURES

1. PURPOSE. This Manual establishes policies, procedures, and criteria for the design and inspection
of Short Range Aids to Navigation (ATON) structures.
2. ACTION. Area and district commanders, commanders of maintenance and logistics commands, and
commanding officers of headquarters units shall ensure that the provisions of this Manual are
followed. Recommendations for changes to this Manual should directed to Commandant (G-SEC).
Internet release is authorized.
3. DIRECTIVES AFFECTED. Chapter 4 (Structures) of the Aids to Navigation Manual - Technical,
COMDTINST M16500.3A, is canceled. This will be reflected in the next revision to that Manual.
4. DISCUSSION. Chapter 4 of COMDTINST M16500.3A was written in the 1970s, with little
subsequent revision. This Manual brings the previous guidance up to date, and provides additional
direction regarding structure condition assessment and climber safety. This Manual also clarifies the
requirement for scheduled engineering inspections of ATON structures by the CEUs. To assist the
CEUs in carrying out this responsibility within existing workload and resource contraints, the
current requirement to inspect lighthouses every two years is hereby extended to every three years.
5. ENVIRONMENTAL ASPECT AND IMPACT CONSIDERATIONS. Environmental
considerations were examined in developing this Manual and are incorporated herein.
6. FORMS/REPORTS. Form CG-4094, Shore Station Maintenance Record, and Form CG-6042,
ATON Structure Inspection Form, are available in USCG Electronic Forms on Standard Workstation
III, and on the Internet at <http://www.uscg.mil/ccs/cit/cim/forms1/welcome.htm>.

/s/


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NON-STANDARD DISTRIBUTION:

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TABLE OF CONTENTS



CHAPTER
1.

INTRODUCTION
Page

A.

General
1-1
B. Classification of ATON Structures




1-1
C.

Roles
and
Responsibilities

1-2
D.

Reference
Documents

1-2


CHAPTER 2. DESIGN CONSIDERATIONS

A.

Introduction

2-1
B.

Design
Overview

2-1
C.

Design
Responsibilities
2-1
D.

Design
Factors
2-2
E.

Structure
Components

2-3


CHAPTER 3. INSPECTION

A.

General
3-1
B.

Scheduled
Structural
Inspection

3-1
C. Field Unit Maintenance Inspection




3-2


CHAPTER 4. CLIMBING SAFETY

A.

General
4-1
B.

Climber
Training

4-1
C.

Requirements
for
Climbers

4-1
D.

Safety
Equipment

4-2
E.

Pre-Climb
Safety
Requirements

4-3
F. Conditioning and Mechanics of Climbing




4-4
G. Rescue








4-5


APPENDIX A - Guidelines for Field Unit Maintenance Inspection


APPENDIX B - Data Sheets


APPENDIX C - Climbing Safety and Rescue Equipment

i

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CHAPTER 1. INTRODUCTION

A. General. Aids to navigation (ATON) structures support visual and audible signal equipment
in a fixed location and at a design elevation that establishes the geographical range of the aid.
Structures are built in a variety of configurations according to the unique geological and
environmental conditions of a given location, as well as the specific nature of the signal
required. They can range from simple and inexpensive daybeacons to complex and costly
offshore lights. Design work, particularly for complex structures, is normally performed by
the Civil Engineering Units (CEUs) or via CEU-administered contracts. Construction is
carried out via CEU-administered commercial contracts, or in the case of many minor
structures, by Coast Guard units such as construction tenders (WLICs), Aids to Navigation
Teams (ANTs), or Integrated Support Command (ISC) industrial forces. Design,
construction, and maintenance of ATON structures are functions of the Shore Facilities
Program, and are funded via the AC&I Waterways program or the AFC-43 program,
depending on the nature of the work involved. Guidance for these funding methods is
provided in the Civil Engineering Manual, COMDTINST M11000.11 (series) and the
Financial Resource Management Manual, COMDTINST M7100.3 (series).

B. Classification of ATON Structures. There are currently over 22,000 ATON structures in use
Coast Guard-wide. For purposes of definition, and to facilitate planning and discussion, they
are grouped into the categories listed below.

1. Major ATON Structures. Major ATON structures are complex in design and construction
and usually require significant engineering effort, including geotechnical and
hydrographic site analysis. Although there may be similarities in the design of the various
types of Major ATON structures, each structure is normally one-of-a kind and specifically
tailored to the unique environmental conditions and operational requirements of a given
location. Ranges and large offshore lights would be typical examples of Major ATON
structures.

2. Minor ATON Structures. Minor ATON structures are relatively simple in design and
construction, and are usually made of wood or concrete piles, steel piles, or other steel
structural shapes. They can be either lighted or unlighted. The same type of structure or a
similar type is built repetitively on a routine basis, and little or no engineering analysis of
individual site locations is required. Examples of minor ATON structure types are
included in the data sheets at the end of this manual.

3. Lighthouses. A lighthouse structure is an enclosed edifice which houses, protects,
displays, or supports visual, audible, or radio aids to navigation. These structures are
usually made of granite, brick, cast iron plate, monolithic stone, concrete, or steel. They
are often lo