From: Michael Brandon <[email protected]>

>Yes, if I kept looking at the PDA I would know when I hit what XCSoar
estimates is final glide, but why can't XCSoar give me a realistic estimate
in the first place? Remember, I'm a simple chap - if I'm at 4,0000 ft and
XCSoar says I need to climb 3,000 ft, I'm going to make 7,000 ft my mental
target and - assuming the thermal doesn't weaken - see what XCSoar says when
I get there, or at least, close to there.

I think it´s a matter of how we use and trust the information provided by
XCSoar or any other instrument or software. In my humble opinion, your
example case (climbing 3000ft without noticing that you drift away from
wherever you want to go) would be poor pilotship, and not a software topic -
no pun intended, we all know this is a test case to support discussion.
One of the things I like about soaring is that it is hardly predictable and
things are changing every minute. Sometimes I am more interested in a trend
than in the actual value of some info box to support my decision making, and
that´s where I would prefer the simple "arrival altitude" model over the
mathematically correct but harder to anticipate "height gain required"
model.

Michael


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