When computing gross under keel clearance...

Question 1 of 31048pSO7uEupIUM7m9gSn39R

When computing gross under keel clearance (UKC), what factor should NOT be considered?

Question 1 of 31048

When computing gross under keel clearance (UKC), what factor should NOT be considered?

🔍 Key Concepts

• Understand what gross under keel clearance (UKC) represents versus net UKC • Know which allowances are normally ADDED to charted depth or draft: squat, heel, tidal/water level variations • Distinguish between tide-related residuals and effects from wind or current

💭 Think About

• Ask yourself: When we talk about gross UKC, are we looking at a simple hydrographic/level difference, or are we already adjusting for the ship’s dynamic motions and attitudes? • Which of these options is clearly a vessel-related dynamic effect (how the ship sits/moves in the water), and which is a water-level variation? • Think: Which factor is usually applied later as a safety margin or operational consideration, rather than in the basic gross UKC calculation itself?

✅ Before You Answer

• Be clear on the difference between gross UKC (basic clearance) and net/operational UKC (after allowances). • Verify which allowances are ship-motion related (change draft or clearance due to ship’s movement/attitude) versus purely water-level residuals. • Check your study materials: identify which residuals are normally treated as corrections to predicted tide rather than part of the gross UKC computation.