🔍 Key Concepts

• Rule 27 – Vessels Not Under Command or Restricted in Their Ability to Manoeuvre in the Navigation Rules • Difference between lights (used at night or in restricted visibility) and shapes (used by day) • When shapes are required even if visibility is restricted

💭 Think About

• Ask yourself: Are shapes a daytime signal, nighttime signal, or both? How does that affect when they must be displayed? • Think about whether restricted visibility (fog, heavy rain) cancels the requirement for shapes, or if the rule still expects them to be shown when possible. • Compare how the rule treats "sunset to sunrise" for lights versus what it says specifically about shapes for the same vessel status.

✅ Before You Answer

• Verify in Rule 27 what it says specifically about shapes, not just lights. • Check whether the rule mentions daylight or restricted visibility in relation to shapes. • Confirm that shapes are a day signal and consider whether any exception is stated for poor visibility.