On Feb 28, 4:13*pm, Max Kellermann wrote:
Ramy wrote:
This is why Safety MC, or polar degradation are better solutions,
since they are not depending on distance.

Safety MC is poor man's polar degradation. *It doesn't make a lot of
sense, and will eventually be removed from XCSoar. *We should have
implemented persistent polar degradation from the start.

Max

Max, first thanks for addressing those issues in 6.3.
I tried both options (polar degradation and safety MC) recently, with
exact same results, so am not completely sure why Safety MC is poor
man's polar degradation. Since MC is now decoupled, I don't see a
problem using it for polar degradation, from the reasons John
described in his article. I think many still prefer to use MC to
degrade the polar instead of polar degradation. I also noticed at
least one advantage in safety MC: when clicking on a waypoint, you can
see you arrival altitude both with safety MC and with MC=0, so you can
estimate your chances to make it in still air. Polar degradation does
not provide such best case scenario an option since MC=0 is already
degraded.
Please explain why safety MC doesn't make a lot of sense.
In any case, I would recommend against removing safety MC, as pilots
may be using it for various reasons.

Ramy