Four P & O cadets of the 'Viceroy of India' on the starboard side of the Bridge Deck with their sextants

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    Reproduction ID: P85348

    Maker: Marine Photo Service

    Date: circa 1930-1939

    Materials: Cellulose acetate negative

    This photograph is featured in Waterline, a new photographic exhibition revealing the joys and trials of the heyday of cruising. It's on at the National Maritime Museum until October 2011, www.nmm.ac.uk/waterline/

    1. Serendigity 41 months ago | reply

      Ah, I did this sort of thing during my Midshipman training in the Navy. Whilst they may just be posing for the photo, they are more likely preparing for MerPass.

      The Meridian Passage a.k.a. MERPASS a.k.a. The Noon Sight measures the highest altitude of the sun at local noon allowing one to work out the Zenith distance, Zd 90° - observed altitude If dec is North and Zd South or Vice versa latitude = sum of dec and Zd else latitude = difference between dec and Zd. In short, you can work out your location using astronomical tables and some spherical trigonometry. These days they all use GPS.

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