Chart Navigation & Plotting · Sailings — dLat from Course and Distance
A vessel runs 60 NM on a course of 030°T. What is the difference of latitude made good?
- A52' N✓ Correct
- B30' N
- C60' N
- D42' N
Explanation
dLat = distance × cos(course) = 60 × cos 30° = 60 × 0.8660 = 52.0', i.e., 52' of latitude to the north. (Departure = 60 × sin 30° = 30' E.)
Authority: Bowditch (Pub. No. 9), Plane Sailing
Practice the full Chart Navigation & Plotting bank
Free spaced-repetition quizzing across 2550 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Chart Navigation & Plotting questions
- Chart Basics
On a Mercator chart, one nautical mile is measured using the:
- Chart Basics
The principal advantage of the Mercator projection for navigation is that:
- Chart Basics
Charted depths (soundings) on a U.S. chart are referenced to which tidal datum?
- Chart Basics
Vertical clearances of bridges and overhead cables on a U.S. chart are normally referenced to:
- Distance, Speed & Time
A vessel makes good 12 knots. How far does it travel in 20 minutes?
- Distance, Speed & Time
A vessel covers 9 nautical miles in 45 minutes. What is its speed?