Before you start
Gather the appropriate supplies and review the specific equipment manual.
- AIS-capable display
- Current charts
- Visual lookout
Step-by-step instructions
Confirm your receiver status
Check the display, antenna connection indications and your own transmit state if your equipment transmits.
Read the relevant target fields
Identify position, course over ground, speed over ground and estimated closest point of approach.
Watch trends over time
CPA and TCPA can change as boats maneuver; use multiple updates rather than one calculation.
Cross-check with sight and radar
Look for small craft, unreported targets and targets whose data is missing or delayed.
Follow collision regulations
Use visual bearings and COLREGs responsibilities, maintaining safe speed and a proper lookout.
Safety note
AIS does not detect every vessel and may contain incorrect or delayed data. It never replaces a lookout or radar where carried.
Key takeaway
Treat AIS as one information source in a complete collision-avoidance picture.
Keep this job on your maintenance schedule
Save the topic as a maintenance task, choose a due date or engine-hour target, and record future service. Free and stored on your device.
Add to my maintenance plannerThis guide is for general education. Follow your equipment manufacturer’s instructions, current navigation guidance and applicable marine safety standards. When uncertain, use a qualified marine professional.