On Nov 22, 2011, at 4:06 PM, Andreas Pfaller wrote:

> On Tuesday, November 22, 2011, David Reitter wrote:
> 
>> It seems that users find the need to play "what if", and they manipulate
>> MC to do so  (and for other wrong reasons, as you point out).  So
>> there's a need to let them do that, is there not?
> The can play with the MC setting however they like for "what if" scenarios.
> I probably even makes sense. xcsoar will happily calculate an answer to that
> "what if" scenarios. Depending on the input the answers may be extreme or
> indicated as not achieveable, i.e. with low MC value and high headwind, where
> older devices might give a nice looking number suiting the user which is 
> wrong.

If not achievable, why not show a message the moment MC is changed?  
"<WAYPOINT-NAME> needs MC>X due wind drift" (if the waypoint is not achievable 
at current MC settings due to wind drift).


Besides I was referring to a "what if I flew speed Vx" scenario.  Concretely, I 
would want to know the range of speeds that would allow me to get to my 
destination above minimum safe arrival altitude.  There may be various reasons 
why people would want to fly faster or slower without circling, i.e., while 
still assuming MC=0.



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