Configuration using proAtoN
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● Nominal position
Enter the nominal or charted position of the AtoN. This is the position transmitted to other AIS users
for a fixed AtoN when the ‘Surveyed’ EPFS type is selected. For all other configurations this position
is used to perform ‘off position’ calculations only; the actual GPS position is broadcast to other users.
○ The application can average the current GPS position over 5 minutes and use this value for the
nominal position. Click the ‘Get GPS position’ button to the right of the latitude and longitude fields
to begin this process.
N.B. The GPS location should only be captured at the installation
location.
○ The position accuracy can only be entered when the type of EPFS is set to ‘Surveyed’. The
accuracy should be set in accordance with the accuracy of the surveyed position.
● Off position alternate message enable
The current GPS position is compared to the nominal position according to the algorithm defined in
IALA A-126 Annex A, Example 1. The off position threshold distance is specified in metres. If the
transceiver determines that it is ‘off position’ then the alternate reporting schedule for message #21
(index 2) is enabled. For example, the alternate reporting schedule could be configured to decrease
the reporting interval if the AtoN has drifted off position. The off position flag in message #21 is set
when off position regardless of this setting.
The transceiver off position algorithm is always operational and compares the current GPS position to
the nominal position of the transceiver.
● MMSI for addressed messages
This is the destination MMSI used for all addressed message types generated by the transceiver. This
is usually the MMSI of a shore station collecting status information from the transceiver. It is also
possible to enable the acknowledgement of received binary messages (via message #7 or #13).
● Dimensions
The dimensions of the AtoN should be entered to the nearest metre. Guidance on the appropriate
configuration of dimensions for various types of AtoN can be found in IALA A-126.
● Radio channels
Selection of alternative radio channels for AIS transmission and reception is possible, however in
most cases the default channels (AIS1 and AIS2) should be used.
● Transmitter power level
The transmitter power level for the transceiver can be selected as 1W, 2W, 5W or 12.5W. The default
value of 12.5W is appropriate for most scenarios.
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