Aids to Navigation monitoring data

Introduction/Additional information: 

Monitoring the status of lighthouse equipment and buoys; reliability, maintenance, availability

Registrant: 
UK Trinity House
Message number: 
6
DAC: 
235
FI: 
10
State: 
in force
Used by: 
UK Trinity House
Commissioners of Irish Lights
Northern Lighthouse Board
Number of slots (max): 
1
Reporting Rate: 
Varies, depending on the type of AtoN (1-10 minutes) The interval between the transmission of these messages will be synchronized with message 21, although not necessarily at the same reporting rate. If Message 21 is not used at a particular site, then the reporting interval should be selected to minimise the power requirement of the transponder, whilst still providing enough data to enable meaningful diagnostic analysis.
How portrayed: 

Text and graphical (at shore-based monitoring centres, buoy tending vessels) - uses ICAN “Bespoke” dedicated graphic software for display - shows trending over time; alarm dispatching, etc.

Permitted as from: 
15/01/2009
Technical point of contact: 

Alan Stuwart

Details: 

 

Parameter

Number of bits

Description

Message ID

6

Identifier for this message 6; always 6.

Repeat Indicator

2

Used by the repeater to indicate how many times a message has been repeated.

0 - 3; default = 0; 3 = do not repeat any more.

Source ID

30

MMSI number of source Unit

Sequence Number

2

0 - 3

Destination ID

30

MMSI number of destination Unit.

Retransmit Flag

1

Retransmit Flag should be set upon retransmission:

0 = no retransmission = default

1 = retransmitted.

Spare

1

Not used.  Should be zero.

DAC

10

Destination Area Code.

Default: 235 (UK & NI) or 250 (ROI)

FI

6

Function Identifier

Default: 10 for this GLA standard message

Analogue (internal)

10

0.05- 36V 0.05V step Supply voltage to AIS Unit

0 - Not Used

Analogue (external -

from hardware analogue input No 1

10

0.05 - 36V 0.05V step

0 - Not Used

Analogue (external -

from hardware analogue input No 2

10

0.05 - 36V 0.05V step

0 - Not Used

Status Bits   0 / 1

(internal - same as the 5 LSBs of status bits from Message type 21)

5

4  \ /  00 - no RACON installed;  01 - RACON not monitored

3  / \  10 - RACON operational;  11 - RACON ERROR

2  \ /  00 - no light or no monitoring;  01 - Light ON

1  / \  10 - Light OFF;  11 - Light ERROR

0    0 - Good Health, 1 - Alarm

Status Bits   0 / 1

(external - derived from hardware digital inputs)

8

7  Digital Input   Off/ / On

:

:

0  Digital Input   Off/ / On

Off Position Status

1

Off position or On position

0:  On position

1:  Off position

Spare

4

For future use.  Should be zero.

TOTAL OF BITS.

136

Occupies 1 slot.