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IFD540/440 Touch Screen GPS/NAV/COM : Issue with Direct To distance count down

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Author: MysticCobra
Subject: Issue with Direct To distance count down
Posted: 19 Feb 2015 at 5:13pm

Originally posted by 94S 94S wrote:

As you talked about in your 10:53am post today, there is no way of knowing why a pilot has left the planed route.  Or if, how or when he/she might rejoin the route.  That's why in my simple way of looking at things it seems the most appropriate way to display the TO Waypoint data is with the direct-to info for the next down-plan waypoint.  If you're on the course it's correct.  If you're off the course, it's correct.  Simple.  

Except, that's not true.  If you're flying a DME arc, the distance along the arc to the next waypoint and the straight-line distance to the next waypoint are not the same.  If you're flying a course reversal, the along-track distance is not the same as the direct-to distance (to the next waypoint).

As Steve has explained, it's not so simple.  If it were, there would never have been a need for this discussion.


Edited by MysticCobra - 1 hour 46 minutes ago at 5:14pm

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