You are planning a voyage by great circle from the mouth of the Delaware River (LAT 38°40'N, LONG 75°00'W) to Lisbon, Portugal. Which statement is TRUE? (Use gnomonic tracking chart WOXZC 5274.)

Correct Answer: Option A — You will reach the northernmost latitude of the voyage in the vicinity of LONG 42°30'W.

The maximum latitude or Northern Hemisphere vertex on a great circle route from the Delaware River to Lisbon is reached near longitude 42°30'W, matching gnomonic projection plotting standards outlined in Bowditch for transatlantic voyages.