On Dec 26, 6:51*pm, Dave Nadler wrote:
On Monday, December 26, 2011 7:07:26 PM UTC-5, kirk.stant wrote:
On Dec 26, 11:40*am, "PCool" wrote:
To me (and I used to navigate planes for a living so I'm a bit biased)
the only orientation that really makes sense is Heading up -
especially if there is a lot of crosswind. *I want the map to mirror
what is outside the cockpit, and with track up and a crosswind, it's
possible for a feature in the distance (mountain, for example) to be
on one side of the map centerline, but on the other side of the
canopy, due to the glider's crab angle.

"Heading Up" does not match what you see out the cockpit with crosswind.
That is why ILEC SN10 does "nose up", matching your view...

Hope that's clear !
Best Regards, Dave "YO electric"

Uh, Dave, heading up and nose up are the same thing. Heading (which
way the pointy end is pointed, and read on the drippy compass thingy)
adjusted for the drift due to a crosswind is Track. Track up and Nose
up are only the same if there is either no wind, or the wind is a
direct tail or headwind.

Exaggerated example - I've got 30 degrees of drift to the right. My
goal is a mountain peak in the distance, and I've adjusted my heading
(which way my nose is pointing) 30 degrees to the left to compensate
for the drift, and my track is now directly towards the mountain.
Looking out the cockpit, the mountain is 30 degrees right of the
nose. If my map is Track Up, it shows the mountain directly ahead.
If the map is Heading up, it shows the mountain 30 degrees to the
right (matching my view out the window). Hopefully with a Track Line
showing that I'm going the right direction!

GPS navigators typically only present Track, because they have no way
of knowing heading without a compass input from the plane. Or, given
a wind, they can "back-in" heading by subtracting drift from track to
get heading.

Nav lesson for the day is now over - back to football!

Cheers,

Kirk