On 31 Dec 2008, at 13:09, James Turner wrote:
> ...as giving a value of 0.32 degrees GS deviation per dot. I'd love to
> know if this is correct, and what the VOR/HSI deviation is (in degrees
> per dot) (I believe the 'LOC is 4x the sensitivity of VOR' rule is
> indeed correct, but again, please confirm or deny this).
>
> Assuming we can agree the ratios, I will then add gs-deviation-dots
> and cdi-deviation-dots properties to navradio, and hopefully remove
> that source of problems going forwards.
Addendum, this source:
http://www.pilotfriend.com/training/flight_training/fxd_wing/hsi.htm
Reckons 5 degrees per-dot for a VOR, 1.25 for a LOC (yay, the 4x
factor is sane) and 'about a quarter of a degree per dot' for a GS
indicator, so the 0.32 term is plausible.
It does also mention some alternative dot mappings when the HSI/CDI is
coupled to a GPS-style navigation source, but there's a whole set of
issues related to navradio's GPS-slaved-mode there, which I will think
about 'in the future'.
James
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