John I was using a sextant on HM Cable ships in 1962 (Post BI ) and Decca came to an end with the introduction of GPS. Salaams Ron -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.bcn.mythic-beasts.com/pipermail/bitlist/attachments/20160427/c49e79f6/attachment.html>