What is AIS on a boat is a common question for vessel owners looking to improve safety, tracking, and situational awareness at sea. AIS (Automatic Identification System) is a tracking system that allows vessels to broadcast and receive real-time information such as position, speed, and identity.
Originally developed for commercial shipping, AIS is now widely used on leisure boats, fishing vessels, and workboats to improve visibility and reduce the risk of collision.
This guide explains how AIS works, the different types available, and how to choose the right AIS system for your boat.
How Does AIS Work on a Boat?
AIS works by using VHF radio frequencies to transmit and receive vessel data between nearby boats, ships, base stations, and navigation equipment. See our marine VHF antenna range guide to understand how antenna setup affects performance.
An AIS unit broadcasts information such as vessel name, MMSI number, position, course, speed, and navigation status. This information can then be displayed on compatible chartplotters, multifunction displays, AIS receivers, or onboard software.
The main benefit is improved awareness of nearby traffic, especially in poor visibility, busy waterways, commercial shipping lanes, and offshore passages.
Types of AIS Systems (Class A vs Class B)
There are two main types of AIS transceivers used on boats: Class A and Class B. The main difference is transmission power, update rate, and intended use.
- Class A AIS: Used on commercial vessels and SOLAS ships. Higher transmission power, faster update rates, and full regulatory compliance.
- Class B AIS: Designed for leisure boats and smaller commercial vessels. Lower power output but still provides effective tracking and visibility.
Class B AIS is the most common choice for recreational boating, offering a balance between cost, performance, and ease of installation.
Do You Need AIS on Your Boat?
AIS is not mandatory for most leisure vessels, but it is strongly recommended for safety, awareness, and collision avoidance.
- Improves visibility to other vessels, including commercial ships
- Allows you to track nearby traffic in real time
- Enhances safety in poor visibility conditions such as fog or night navigation
- Useful for coastal cruising, offshore passages, and busy waterways
For many boat owners, AIS provides an additional layer of safety that complements radar, chartplotters, and traditional navigation methods.
EM Trak AIS Systems
F&C Marine supplies a full range of EM Trak AIS transceivers, receivers, and tracking systems suitable for both leisure and commercial marine use.
- Class A AIS: EM Trak A200 for SOLAS and commercial vessels
- Class B AIS (2W): EM Trak B921, B922, B923, B924
- Class B AIS (5W SOTDMA): EM Trak B951, B952, B953, B954
- Integrated display AIS: EM Trak B400
- Battery backup AIS: EM Trak B200
- VHF & AIS system: EM Trak X100
- AIS receiver: EM Trak R300
- Antenna splitter: EM Trak S300
- Vessel tracker: EM Trak I100-X
These systems are designed for reliable performance, easy installation, and integration with standard marine electronics including chartplotters and onboard networks.
Conclusion
AIS is a valuable addition to any marine navigation setup, improving safety, awareness, and communication between vessels.
Whether you are operating a small leisure boat or a commercial vessel, choosing the right AIS system depends on your usage, vessel type, and installation requirements.
F&C Marine supplies a full range of EM Trak AIS systems to suit different applications, from entry-level Class B units to fully integrated commercial solutions.