On a voyage via the southern tip of Nova Scotia (LAT 43°20'N, LONG 65°35'W) you wish to sail the shortest route to La Coruna, Spain (LAT 43°20'N, LONG 8°24'W). Which of the following will require you to plot a composite sailing? (Use gnomonic tracking chart WOXZC 5274)

Correct Answer: Option B — Icebergs reported extending west to west-northwest from LAT 47°00'N, LONG 35°00'W

Composite sailing is required when the unconstrained great circle vertex exceeds a safe limiting latitude due to navigational hazards such as icebergs. Reported icebergs near 47°N force the vessel to cap its latitude along a safe parallel until clear.