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Configuration using proAtoN

Page 33

The status bar displays the current connection status of the application (bottom left) and the current GNSS time
(if available, bottom right).

The following sections describe the configuration options available and their effect on the behavior of the
transceiver. Configuration of an AIS AtoN transceiver requires knowledge of the local AIS environment and
may require interaction with shore infrastructure. Familiarity with the current IALA guidelines on the use of AIS
Aids to Navigation (IALA A-126) is assumed.

The following parameters associated with the ‘real’ AIS AtoN transceiver should be configured via the ‘Real 
AtoN’ tab:

The MMSI number associated with the ‘real’ AtoN. Typically the MMSI number for a ‘real’ AtoN station 
follows the format 99MID1XXX where MID is the appropriate national MID and XXX is a number 
unique to this station.

The name of the AtoN station as broadcast to other AIS users. Up to 34 characters are available for 
the name.

Select from a list of possible types of AtoN. The types are as defined by IALA in IALA A-126.

Select the type of EPFS (Electronic Position Fixing System) used by the transceiver. Note this 
selection does not affect the hardware configuration, only the contents of the ‘Type of EPFS’ field in 
transmitted AtoN position reports. The transceiver is equiped with a GPS module by default. 
Alternatively for a fixed or shore based transceiver a surveyed position type can be selected. Note 
that when the surveyed position is selected the surveyed position is broadcast to other AIS users and 
GNSS position information is ignored.

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 GNSS position is broadcast to other 
users. 
○ The application can average the current GNSS position over 5 minutes and use this value for the 

nominal position. Click the ‘Get GNSS position’ button to the right of the latitude and longitude 
fields to begin this process.

○ 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.

The current GNSS 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 GNSS position 
to the nominal position of the transceiver.