NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Closest point of approach.
From: Dan Allen
Date: 2000 Aug 15, 4:36 PM
From: Dan Allen
Date: 2000 Aug 15, 4:36 PM
I have found an analytical solution to this problem. See my web page at http://www.nwlink.com/~danallen/CPA.htm for a JavaScript interactive calculator for solving the Closest Point of Approach problem. View the source to see the underlying formulas. Dan Allen -----Original Message----- From Navigation Mailing List [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of Russell Sher Sent: Friday, August 11, 2000 7:09 AM To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM Subject: Closest point of approach. Does anyone know a simple way of calculating the closest point of approach between two vessels on given courses at given speeds? I would imagine that one method is to plot the courses and calculate which vessel will reach the point of intersection of the projected tracks first. The distance to the other vessel should give the CPA ( correct ?) There is no doubt a better method using the relative course - any input on this? I'm a bit suprisesd that few, if any, small-boat navigation books discuss this. regards Russell
