> the more expensive Crossbow 500 which is purely inertial
the 500 uses both gps and airdata for aiding. this was added
in CFS v4.1 and refined in CFS v5.0 early 2004. CFS spent
quite abit of time at xbow, on CFS expense to refine this
aiding. its a long story. you can see the hole aiding packet
received via 232 in the xbow manual on page 30
http://xbow.com/Support/Support_pdf_files/AHRS500GA_Operators_Manual.pdf
this reduced acceleration errors, commonly seen as a tilt on landing.

> Pinpoint's single page web site if their unit is GPS augmented
> or entirely inertial.
Pinpoint/Chelton uses 3d accelerometer, 3d rate, 3d flux,
airdata, gps (internal or external) internal temp and internal
heater with oat and lots of kalman filter like math to control
drift and provide an inertial fix. wonder how the
http://www.cheltonsatcom.com antenna's stay fixed on a point?

> GPS in the Pinpoint is standard or an option
CFS needs some kinda gps... you can buy a freeflight,
garmin gps35, (don't use the gps18, but it will work)
or one that's an option on the pinpoint/chelton.

> so you'd have to add the ADC function to a Crossbow installation.
very good point..

if any d2a depositors are too upset to spend another $10,300
pls forward your proof of deposit and I'll mail you $5,000.
that is if CFS's deal is transferable which I kinda doubt.

Rob