HP 29 GPS: the view from 9865 meters!

[Massimo Gnerucci]

(07-12-2017 12:55 PM)rprosperi Wrote:  

(07-12-2017 11:29 AM)Etienne Victoria Wrote:  The reason is that I miserably failed in embedding the picture.

I hope I have fixed it now.

Etienne - FYI - The photo I see in your original post above is the same as the one from 2 days ago - 3 Woodstocks side-by-side. I've refreshed to be sure it's not a cached image and it still appears the same.

FWIW I couldn't see them until today.

[pier4r]

Ot

(07-11-2017 08:42 PM)Eric Rechlin Wrote:  Photobucket has changed to a non-free image hosting service, requiring anyone who wants their images to be restored to pay a $400/year subscription. Quite frankly, I don't know why anyone has used Photobucket for years, because they have long been a poor service.

I've been using imgur for a while (probably about 8 years) for hosting images I post to forums, and while they have gone downhill they haven't pulled anything anywhere near this bad yet.

Hopefully Geoff has backups of his images so he can rehost them elsewhere and then update his posts.

Nice to know . Anyway imgur serves Reddit so should be quite strong.

[Andres]

9865 meters... Well, next time please tweak a little your autopilot, as an altitude of 9845, 9835, 9830, 9825, 9820, 9815 or 9810 would have been more appropriate! ;-)

[Geoff Quickfall]

Ahhh,

But we are flying on a pressure altitude not areal altitude above ground.

;-)

I will attempt to migrate pictures to imgur. Never had a problem with the 2000+ images at photobucket but I will be damned that I will be held hostage including retroactively! And yes, the photos are there.

[Gerson W. Barbosa]

(07-11-2017 08:42 PM)Eric Rechlin Wrote:  Hopefully Geoff has backups of his images so he can rehost them elsewhere and then update his posts.

No need for backups, fortunately:

"Are my pictures still safe?
Yes! All your photos are still available by logging into your Photobucket Account. Photobucket has only restricted the ability to view your photos on 3rd party sites."

[StephenG1CMZ]

(06-02-2017 06:01 AM)PANAMATIK Wrote:  

(06-01-2017 10:40 PM)Paul Dale Wrote:  Military grade GPS units will. Civilian ones are artificially limited to a maximum altitude of 18 km and a maximum speed of 1,000 knots (sometimes both, sometimes either).

These limits are imposed by software, so it is possible to remove them from some GPS devices by updating their firmware.

Pauli

That's interesting. I knew only of the software imposed position inaccuracy, which is deactivated for civilian areas today, but of course from military view height and speed would be important informations for enemy missiles. From mathematical view GPS could provide altitudes high above (on the other side of) the GPS satellites up to many thousands of kilometers to get positions relative to earth, until distances are too far to get high angles between them. But I assume no GPS satellite will direct its signals away from earth, it would be a waste of transmission power.

I don't know what happens in the HP-29E GPS when more than 1000 knots are displayed (see picture no digit left), Geoff, please keep below this barrier.

Bernhard

I'm thinking the primary reason for the speed/altitude limits is not because of reporting where an aircraft is as a potential target for a missile...
It's to try to prevent a commercial GPS being utilised as a guidance system in an improvised missile.
But it has been a while...