The navigation team sailing the Americas has a tricky manoeuvre to manage. The highlight of the voyage for passengers is traversing the Panama Canal, but cruising the locks requires maximum skill and concentration. Meanwhile, in Europe, Nottinghamshire couple Claire and Graham are whale spotting in Tenerife. Unfamiliar with scouring the horizon, they could do with a tip from security officer Rich who, after four decades at sea, has a database filled with thousands of ship sightings