Sign in to follow this  
Guest toreb

A question about the coordinate system

Recommended Posts

How do you determine the midway point between two coordinates? For example, how would I determine the middle point between 41.8677777, 87.2780555 (which is N41*52.04, W87*16.41) and 41.8677777, 87.2663888(which is N41*52.04, W87*15.59). I'm not very good at all this so please explain it as if you're talking to a newbie.Thank you very much.

Share this post


Link to post
Help AVSIM continue to serve you!
Please donate today!

As with every in aviation "half-way" comes in several different units.There is the geographic "half-way" which is a point on the route where the distance measurement is equal...pretty simple there (see the link in the other response on this thread).HOWEVER (and there always seems to be a "however") there is the much more important "half-way" measured in hours. This is a fun one to figure because it is based on winds aloft and varies day-to-day,hour to hourch more important to long hauls due to the impact on fuel burns and required fuel reserves when landing.In the old 747-200 days when flying DWT/ORD to Narita our release point was to a point 300 miles west of Anchorage where dispatch and crew would take a "how-goes-it" and determine if we had enough fuel on-board to "legally" make it. If we didn't we would turn back to Anchorage for a technical stop and gas-up.Now with ETOPS(Engines Turns Or Passengers Swim) figuring the effects of winds and various options much more "critical" to safe operations.This is one of the reason why long-haul flights have a much longer planning session then a domestic run....with a lot more "barin-teazers".Tim757

Share this post


Link to post

Thanks for the information, Toreb and Tim.Christine

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this