On 2018-12-12, NY  wrote:

> "druck"  wrote in message
> news:purto0$vg4$1@dont-email.me...
>
>> 2) GPS far less than perfect when used in aircraft, and is only
>>    ever used in addition to other navigation and precision approach
>>    systems.
>
> That's interesting. I'd have thought that with a good aerial and no
> obstructions so you can see lots of satellites you should be able to get
> very good results.

If "lots of satellites" includes the WAAS (Wide Area Augmentation System)
network, you can get down to 6m or better.

> My phone varies between about 20m and 5m radius of error for lateral
> movement. Not sure how accurate it is for altitude. I sometimes find that I
> get a systematic error which causes a track to follow the twists and turns
> in a road perfectly - except offset by maybe 100 m.
>
> What are the current "other navigation and precision approach systems"? Is
> it still NDB, VOR and ILS, or have things moved on since I used to "fly"
> planes in MS Flight Simulator?

If your GPS is equipped with WAAS, there are LPV (localizer performance
with vertical guidance) approaches which you can fly just like an ILS,
using the same panel indicators, down to minimums almost as good as ILS.
These approaches have been set up at many airports that have no ground-based
navaids.

It's a wonderful time to get an instrument rating.  :-)

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