difference between lrit and ais

Difference between LRIT and AIS System

Both Long Range Identification and Tracking (LRIT) and Automatic Identification System (AIS) have different purpose altogether but are important to ships at sea. AIS is an broadcast system, whereas LRIT is reporting system.

AIS is a system which provides a means whereby ships exchange information such as ID, position, course, speed and other vital data, with all other ships in the vicinity and shore stations. The data exchange in AIS system is totally automatic and transparent to the users of the system.

LRIT is developed to enhance maritime safety, security and to protect the marine environment. LRIT allows member states to receive position reports from vessels operating in proximity to the State's coastline.

But the most asked question in examinations and doubts between candidates as to what is the difference between LRIT and AIS, so let us see.

Difference between LRIT and AIS

LRIT AIS
Long Range Identification and Tracking Automatic Identification System
All ships of 300 GT and above on International voyages, and all ships of 500 GT on coastal voyages are to be fitted with LRIT All ships of 300 GT and above on International voyages, and all ships of 500 GT on coastal voyages are to be fitted with AIS
Any Indian Registered Ship on Indian Coast of 1600 GT and less is not required to carry LRIT Any vessel of more than 100 GT or 20 meters in length along Indian coast is required to carry AIS
LRIT works on satellite Communication AIS works on VHF communication
No Fixed Channel AIS has 2 dedicated channels 87B and 88B
Worldwide coverage is available for LRIT Coverage for AIS is 35-40 nautical miles
Closed Loop Communication Broadcast System
Response to Flag State poll call / query Transmits automatically at fixed time intervals
Transmits; Identity, Position, Date & Time Transmits; Static, Voyage, Dynamic and Safety Data
Normal Time Interval Every 6 Hours, can be changed to Min Every 15 minutes or Max once in every 24 Hrs Time Interval Depends upon Navigational Status and speed of vessel
LRIT is connected to VDR and has inputs from GPS AIS is connected to Raddar, ECDIS and VDR and has inputs from GPS, Gyro, ROTI, Log
Track and locate ship in Long Range Track & Locate Ship in coastal water
LRIT is not an Aid to navigation AIS is an Aid to navigation
LRIT information is not available to vessels in the vicinity AIS information is available to ships in vicinity.
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