Determine the distance from LAT 63°54.0'N,...

Question 1 / 2707066636eea28f7522a1c51b0b1

Question 1 of 2707066636eea28f7522a1c51b0b1

Determine the distance from LAT 63°54.0'N, LONG 04°52.0'E to LAT 63°54.0'N, LONG 18°24.0'W by parallel sailing.

Question 1 of 27070

Determine the distance from LAT 63°54.0'N, LONG 04°52.0'E to LAT 63°54.0'N, LONG 18°24.0'W by parallel sailing.

🔍 Key Concepts

• Parallel sailing uses the departure to find distance when latitude is constant • Departure formula: departure = (difference of longitude in minutes of arc) × cosine of latitude • Convert degrees and minutes of longitude to total minutes of arc before applying cosine

💭 Think About

• Are both positions on the same parallel of latitude, and what does that allow you to assume about the track? • How do you convert the total difference in longitude between east and west longitudes into minutes of arc? • Once you have the departure, how do you relate it directly to distance in nautical miles on a Mercator chart at this latitude?

✅ Before You Answer

• Be sure you combine east and west longitudes correctly to get the full difference in longitude • Use the mean latitude (or in this case the common latitude) in your cosine, not the longitude • Check that your final distance is in nautical miles, not minutes of longitude or some other unit

Question 1 of 27070

Determine the distance from LAT 63°54.0'N, LONG 04°52.0'E to LAT 63°54.0'N, LONG 18°24.0'W by parallel sailing.

608.6 miles

610.9 miles

612.3 miles

614.2 miles