Automatic Identification System (AIS) technology has quietly become one of the most valuable safety tools in modern boating. What started as a requirement for large commercial ships is now transforming the way recreational boaters navigate, communicate, and stay safe on the water.
At The GPS Store, we’ve seen firsthand how quickly AIS has moved from a “nice to have” to an essential part of a well-equipped helm. But with so many new options stand-alone units, AIS/VHF combos, black box modules it’s easy to get lost in the details. Let’s break it down.
What Exactly Is AIS?
AIS is an automatic tracking system that uses transponders to share a vessel’s information its position, speed, bearing, and identity with other boats and shore stations. Think of it as a digital handshake between vessels, designed to improve situational awareness and prevent collisions.
Every AIS-equipped vessel continuously broadcasts this data. That means your chartplotter or radar can display surrounding traffic in real time whether you’re navigating a busy harbor or running offshore at night.
Class A vs. Class B: What’s the Difference?
There are two main types of AIS systems:
- Class A: Commercial-grade, mandated for ships over 300 tons and all passenger vessels. These transmit at higher power (12W) and reach over 40 miles.
- Class B: Designed for recreational use. They’re more affordable, easier to install, and transmit at 2W enough for roughly 5–10 miles of visibility.
Both systems receive all AIS signals, but only Class A units must broadcast continuously. Class B units can operate in “receive-only” mode when discretion is needed, or transmit to make your vessel visible to others.
Each AIS device is registered with a unique MMSI number, which acts as your boat’s digital ID on the water.
Transceiver or Receiver: Which Do You Need?
This is one of the most common questions we get.
A receiver lets you see other AIS-equipped vessels nearby great for awareness in crowded waters.
A transceiver adds the ability for others to see you which can be crucial in low visibility, during tournaments, or in emergencies when you want rescuers to pinpoint your location.
If safety and visibility are top priorities, a transceiver is often worth the investment.
Choosing the Right System for Your Boat
Smaller boats benefit from compact, waterproof AIS modules like the SI-TEX Metadata, which integrates easily with most navigation systems via NMEA2000 or USB. Larger vessels or those navigating commercial channels may prefer dedicated AIS displays with advanced features target filtering, CPA/TCPA alarms, and radar-style mapping.
The right setup depends on your vessel size, your navigation environment, and how you like to manage your data. Many newer chartplotters and multifunction displays also accept AIS input directly, so integration can be seamless.
The Future of Safer Navigation
AIS isn’t just about compliance it’s about connection. Whether you’re a weekend cruiser or an offshore angler, being able to see and be seen is one of the most effective ways to keep your crew safe.
In Part 2 of this series, we’ll explore how boaters are using AIS in real-world situations from avoiding collisions to coordinating with friends on the water.
Until then, if you’re curious which AIS system fits your setup, the experts at The GPS Store are always happy to guide you toward the right choice.
Shopt The GPS Store or call our team at 1-800-477-2611 . Our customer care team is available Monday through Friday from 9 AM to 5 PM Eastern Time to answer your questions and help you pick the perfect setup.