Max, this is indeed a practical solution to give an option to decouple 302 MC 
settings  from XCSoar, and just set MC=0 in XCSoar. I already opened the ticket 
requesting this, but while this will work for me I am concerns about the rest 
of XCSoar users who don't read this and don't realize what a huge difference MC 
zero vs 0.5 or 1 can make to their decisions with moderate headwind. As I said, 
this almost caused me to turn around and land out in an alternate field until I 
forced myself to ignore what xcsoar was telling me. I had no way to know even 
after carefully reading the manual twice that all I needed was to reduce mc to 
zero to get realistic number. I only figured it out when replaying my flight 
later. 

Thanks,

Ramy

On Nov 22, 2011, at 10:57 PM, Max Kellermann <[email protected]> wrote:

> On 2011/11/22 21:34, Ramy Yanetz <[email protected]> wrote:
>> And since 302 gives my audio STF command, there is no other way I can easily 
>> make it to tell me to fly a little faster than tweaking the MC, and since 
>> this in turns update the MC in XCSoar, hence we have this discussion...
> 
> So it boils down to: you want to have different MacCready settings in
> the CAI302 and XCSoar?
> 
> I worked hard to make linking them possible, and it's pretty easy to
> disconnect them for those who don't want it.  We have a ticket for
> that already, IIRC.
> 
>> Max, we both use the same setup of 302/xcsoar, so I am curious how you 
>> address this scenario of a marginal final glide at the end of the day into a 
>> buoyant 20 knots headwind without causing XCSoar to assume that you plan to 
>> climb and recalculate your arrival altitude. The only way to do it will be 
>> perhaps to add bug factor but this is not what it was designed for and takes 
>> more effort. MC is more intuitive. 
> 
> MacCready is only intuitive because you've been learning all your life
> to do it that way, because legacy computers (and of course the good
> old MacCready ring) can't do better.  It was a kludge based on
> limitations of the tools we had.
> 
> It's not an issue with a modern glide computer.  XCSoar will consider
> the wind in all calculations, and one doesn't need to increase the
> MacCready/Bugs setting to account for head wind.
> 
> On your question: I use AutoMC.
> 
> Max

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