Charlie Gibbs wrote
>> "Dennis Lee Bieber"  wrote
>> I presume both airspeed and altitude gauges include a fairly long
>> time-constant in the needle damping to avoid gusts of wind causing
>> apparent fluctuations in speed and altitude.
>
>Not that long.  In mechanical instruments the inertia of the parts
>provides some damping, but rapid fluctuations will show up.

I have some air pressure chips here, hardly any delay,
very accurate, you can see the difference between on the floor and on the
table.

This is a screenshot of my 'xgpspc' system running on a raspberry pi:
 http://panteltje.com/pub/xgpspc_5_planes.gif

Idea for a drone anti-collision system,
air traffic monitoring via a rtl_sd USB stick and the 'dump1090' program,
air pressure is bottom right,
Added some calculations to get true direction to plane and true elevation.
The yellow 'boat' (or drone) is at the center.

xgpspc can also display pressure of the last 24 hours:
 http://panteltje.com/pub/xgpspc_pressure.gif
give voice storm alerts, other alerts, steer a boat,
measure CO, temperature, humidity, etc etc
all on one old raspberry with a little add-on board I designed,


And display ships of course AIS:
 http://panteltje.com/pub/boats_and_planes.gif

Old source is here:
 http://panteltje.com/panteltje/xgpspc/index.html

There are likely much better systems around like opencpn etc
but this is my own experiment creation, contains features others do not have.
Every now and then I add some things,

--- SoupGate-Win32 v1.05