Raymarine Ray 106 User's Guide download pdf (Page 115)

Chapter 12: Automatic Identification System (AIS) 105

Chapter 12: Automatic Identification System (AIS)

12.1 Introduction

This chapter details the AIS system and how it can be used as a safety aid.

Once set up you can overlay the AIS on chart or radar windows and use it

to:

• Display a target (with heading/speed vectors and rate of turn) for

any other AIS equipped vessels.

• Display basic or detailed information for each target vessel

including safety critical target data.

• View alarm and safety related messages.

12.2 What is AIS?

AIS uses digital radio signals to broadcast ‘real-time’ information between

vessels and shore based stations via dedicated VHF frequencies. This infor-

mation is used to identify and track vessels in the surrounding area and to

provide fast, automatic and accurate collision avoidance data. AIS will

augment your radar application, as it can operate in radar blind spots and

can detect smaller AIS fitted vessels.

WARNING: Smaller vessels do not have to be fitted with AIS

and whilst it is mandatory for larger commercial vessels to

carry AIS, its use is not. You should not therefore assume that

your AIS will display ALL vessels in your area. Due prudence

and judgement should be exercised.

WARNING: AIS should be used to complement not substitute

radar.

Classes of AIS data

AIS data is defined as Class A or Class B. The sending and receiving of Class

A data is compulsory for larger vessels. You will therefore be able to view

all larger vessels on your AIS display. Class B data is applicable to smaller

vessels and is not compulsory. You should not therefore assume that your

AIS is displaying all smaller vessels in your area.

Note:

Not all AIS receivers will decode all information and not all of the

Class A vessels input all of the required AIS data. For example,

some inexpensive AIS Class B receivers do not decode and output

the ship’s name, IMO number and vessel draft/beam/length, desti-

nation etc.

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Raymarine Ray 106 User's Guide Page 115