BOTH INTERNATIONAL & INLAND Which...

🔍 Key Concepts

• Rule 23 – Power-driven vessels underway (requirements for masthead and after masthead lights) • Length thresholds for when a second (after) masthead light is required • Special light configurations for towing/pushing, vessels constrained by draft, and the fact that “trolling” is not a defined lighting category in the Rules

💭 Think About

• First, decide at what vessel length a power-driven vessel must show an after masthead light in addition to the forward one. Which choices are above or below that length? • Look at each type of vessel listed: towing astern, trolling, pushing in composite unit, constrained by draft. For each, ask: do the Rules give them a different masthead requirement, or do they still follow the normal power-driven length rule? • Pay attention to which of these terms has a specific light pattern described in the Rules, and which does not actually appear as a defined category for lights.

✅ Before You Answer

• Verify the exact length at which an after masthead light becomes mandatory for a power-driven vessel (check Rule 23(a) carefully). • Check whether towing astern and pushing/composite units use the normal power-driven masthead pattern plus extra lights, or a totally different rule that removes the need for an after masthead light. • Confirm whether “trolling” appears anywhere in the Navigation Rules as a separate lighting category, and whether being constrained by draft changes the basic masthead/after masthead requirement or just adds additional lights.

BOTH INTERNATIONAL & INLAND Which power-driven vessel is NOT required to carry a light in the position of the after masthead light?

A vessel of 60 meters in length towing astern

A vessel of 45 meters in length trolling

A pushing vessel and a vessel being pushed, in a composite unit and 100 meters in length

Any vessel constrained by her draft

🔍 Key Concepts

💭 Think About

✅ Before You Answer