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Appendix E - AIS connection for MX512 only | 173

Display Field Description:

Transmit Time - Time the message was transmitted

Mode

- Whether it was addressed or broadcast

MMSI - The unique ID of the target

ACK - Auto acknowledgement field. Values are either Yes or No.

Message Field- Text message sent.

Softkey Description:

- View next message

- View previous message

AIS 6 - REGIONAL AREAS

Two VHF and one DSC receiver channels have been designated for AIS use worldwide.

These frequencies are:

IS 1 (Channel 87B, 161.975 MHz, (2087)

•

AIS 2 (Channel 88B, 162.025 MHz, (2088)

•

DSC (Channel 70, 156.525 MHz)

•

Under normal masterless operation, the AIS transponder operates autonomously with

other ships or AIS base stations using the AIS1 & 2 frequencies. When entering areas

controlled by a competent authority (i.e. Coast Guard) under Vessel Tracking System

(VTS) rules, the AIS transponder can be polled and controlled by the VTS station. In

this situation, data communication between ship-to-ship and ship-to-shore stations are

done through the DSC frequency (channel 70). All VTS related activities are happening

without any user intervention.

The controlling VTS base station schedules all ship’s data transmission and provides the

regional parameters shown in AIS 6 display, such as:

Operating frequency, bandwidth and mode of Channel A & B receivers

Northeast and Southwest corner coordinates of the region

Zone size

Date and time tag

These parameters are stored in the memory bank of the AIS transponder and can be

displayed in the CDU. Up to eight regions can be stored by the transponder. The AIS

constantly checks the stored region boundaries and compares it to its own position. If

the distance to the region boundaries is greater than 500 miles from its own position

or the time tag was older than five weeks, those stored regions will be erased from

memory.

The operator (administrator) has the option to do a full or partial editing of the regional

parameters when needed. The conditions below have to be observed when editing:

Use the correct channel numbers (see table A-1, page 143 or in the AIS card)

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Memorex RX 1 Smart Installationshandbuch Seite 175