"J. Severyn" wrote

Actually there are specialized GPS units that can determine attitude and
they have been around for at least 10-12 years. Google the "Trimble TANS
Vector" and you will see one of the earlier units.
http://trl.trimble.com/docushare/dsw...20997-00-C.pdf
They operate by using at least 3 antennae (usually four antennae) and
directly determine roll, pitch and yaw using carrier phase differences
from
the GPS satellites. Of course this is not the way the portable units
derive
the HSI info.

That's some cool stuff.

It seems as though I recall this subject coming up a few years ago in the
homebuilt group, and nobody came forward with a system like this one.

I didn't see a price associated with it anywhere.

Is this a case of, "if you have to ask, you can't afford it?" g
--
Jim in NC