Peter Hall

Change healthy flag to unhealthy per @tridge's suggestion.

Updated the `AIRSPEED_SENSOR_USING` description.

> Knowing whether you have CAS or IAS seems to be important for users. I think that if all sensors can supply CAS then that is a better value to...

@auturgy As the message is written it is clear that is it IAS. ```Indicated airspeed (IAS).``` Possibly you want clarification on what type of airspeed people actually want rather than...

Rebased and renamed to airspeed raw. I really think we should be focusing more on keeping minimum bandwidth for the things users want now than trying to foresee every combination...

Changed back to `AIRSPEED` and from IAS to CAS. I can see the argument that the internal calibration we do moves from IAS to sort of CAS. However we still...

Fixed the typo. @auturgy We don't currently have any way to directly report airspeed readings from sensors. We do report a vehicle level airspeed in `VFR_HUD`. So this is just...

Rebased, should get past CI now.

The line is here: https://github.com/ArduPilot/ardupilot/blob/b0aa456daad5e732d9477481a055f5fa1acd8a77/libraries/APM_Control/AP_YawController.cpp#L119-L123 Your right in that it does not match the Wiki equation. Maybe @tridge or @priseborough will know if that was by design or mistake.

We could make it a ratio of the radius, its only 300m by default. So the 50m backup gets you a 16% more. TBH, i'm not really a fan of...