Before you start
Gather the appropriate supplies and review the specific equipment manual.
- Current navigation charts
- Radar or AIS if fitted
- COLREGs reference
Step-by-step instructions
Recognize reduced visibility early
Track conditions and anticipate fog banks or heavy rain before the boat reaches congested waters.
Reduce speed as appropriate
Use a safe speed based on visibility, traffic, vessel maneuverability and water depth.
Strengthen lookout and signals
Maintain a proper lookout by all available means and follow applicable navigation-light and sound-signal requirements.
Cross-check information
Use radar, AIS, compass and GPS as aids, without assuming every boat is detected electronically.
Choose safer routing
Prefer wider clearances, safe holding areas or delaying a narrow entrance when adequate separation cannot be maintained.
Safety note
COLREGs duties continue in restricted visibility. Electronic targets do not replace a lookout or safe-speed judgment.
Key takeaway
Visibility is a navigation constraint, not merely an inconvenience.
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.