NavList:

Thanks for your replies guys,really appreciated. John I've been searching for that 1975 edition but to no avail,managed to download a fourth edition but dissapointed to found out that the book no longer covers anything that is related to celnav,but I think I can get a sense of his set-up by your description. Jeremy Indeed, I'd say that in the field of practical navigation,expecially in recreational ones,there's no need for a yachtsman to make a big fuss about getting the precise time,since whether your fix is several miles off or dead on doesnt really make a difference on the high seas. But if one were to test the limit of his ability on a stable land, in that case, you might need a stopwatch set-up. Tony One of my pieces also have a split-second function, these split-ones definitely offer great advantage over ordinary timers, especially during twilight when you are trying to get as many observations as possible,but in a limited time.