Sextants were used in aircraft during WW2 for navigation. The accuracy is there, depending on the skill of the navigator. A CD ROM of Bowditch? Thats an abomination against the natural order of the universe. Real navigators ( and would be navigators) lugged that massive blue tome everywhere with all the gravity ( literal and literary) of a preacher and his King James. <img src="/images/graemlins/grin.gif" alt="" />