Does anyone still use the hp41 airborne?

[twdeckard]

(01-27-2014 05:36 PM)Geoff Quickfall Wrote:  Absolutely!!!!!

Fantastic! I really enjoyed the video.

It inspires me to keep plucking at the program. I don't include magnetic variation in the heading calculation.

When I was actually using an early version of this software I was flying around Wisconsin in an old Cessna 170. I was usually pretty close to the agonic line and I didn't really have to sweat the variation. This package uses an old polynomial model and the fellow who developed it suggested I should redo the fit.

If I get really enthusiastic I'll invest in a NovRAM cartridge and see if I can build real database of US fixes.

I have a question. In your video you mention the difference between some great circle distances from your FMS and the values you would calculate. Might be due to which geodetic datum you are using versus your Boeing?

Is it possible that the airplane uses your planned altitude to compute the track length? You fly high enough that 2pi would be a small discrepancy against the charted distance?

Again, I really enjoyed the video.
Thanks
Todd