AI70 AIS is a discontinued product

Simrad AI70 Automatic Identification System image

Replacement for AI70 AIS

AI50

The Simrad AI50 AIS transponder offers boat owners the most exciting new development in the safety of navigation.

Communication and AIS

Wherever you are, stay in touch with compact, powerful, flexible and easy to use units.

Simrad AI70 Automatic Identification System

AI70 is an Automatic Identification System (AIS) that uses VHF communication to transmit and receive AIS data. An AIS system operates primarily on two dedicated VHF channels, AIS 1 – 161,975 MHz and AIS 2 – 162,025 MHz. Where these channels are not available regionally, the AIS can be set to alternate designated channels.

The system broadcasts the vessel's position, speed and course over ground as well as static and voyage related information. Short safety related text messages can be sent between vessels or broadcast from shore based AIS stations or Aids to Navigation like buoys and lighthouses. The on-board installed system is designed to operate automatically and as a stand-alone unit. When not transmitting, the system listens for position information from other vessels or shore based stations.

Coverage

The system radio coverage range is similar to other VHF applications and is dependent on the height of the antenna. The propagation differs from that of a radar, due to the longer wavelength, so it is possible to "see" around bends and behind islands if the landmasses are not too high. A typical value to be expected at sea is 20 nautical miles.

AIS Information Content

AIS type of information is exchanged automatically between vessels, vessels and shore based stations and vessel and Aids to Navigation like buoys and lighthouses. The information transmitted by a vessel’s AIS system is grouped in four categories:

Static Data

- MMSI (Maritime Mobile Service Identity) number
- Call sign and name
- IMO number
- Length and beam
- Type of ship
- Location of position fixing antennas on the ship

Voyage Related Data

- Ship's draught
- Hazardous cargo type
- Destination and ETA (at Master's discretion)

Dynamic Data
- Position with accuracy indication and integrity status
- Time in UTC
- COG (Course over ground)
- SOG (Speed over ground)
- Heading
- Navigational status
- Rate of turn