Celestial Navigation Net - ZetaTalk

astronomic navigation software
The problem
Example of the ASNAv skills
We must find the noon position of our ship on 3 Nov. 1993 at 1000 GMT (1200 Watch Time) given 8 observations (4 sights of stars at sunrise
and 4 sights of the sun during the morning). These observations are real and were taken on 3 November 1993 on board of the LPG tanker
'Eupen'.
Estimated position on 3 Nov. 1993 at 0400 GMT: 32°40'.0 N and 028°48'.0 E
True course = 289° and true speed (speed over the ground) = 17.0 knots
Height of the observer eye = 25 meters
Instrumental error = 2.8 minutes (constant)
Observations:
● ALPHARD at 035551 GMT: 47°23'.0
● SIRIUS at 035826 GMT: 33°12'.5
● ALKAID at 040049 GMT: 33°20'.9
● CAPELLA at 040614 GMT: 47°22'.4
● SUN (lower limb) at 070344 GMT: 27°12'.9
● SUN (lower limb) at 072645 GMT: 30°29'.3
● SUN (lower limb) at 082919 GMT: 37°35'.7
● SUN (lower limb) at 092657 GMT: 41°06'.1
The GPS position at noon was: l GPS 33°13’.6 N and g GPS 026°52’.5 E
http://www.seamanship.co.uk/deck/navigator/ASNAv/ASNAv%20Site/Text/mnl_ex.htm (1 of 12) [9/6/2004 1:45:53 PM]