740 barometric instrument setting? - iFly General Discussions

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740 barometric instrument setting?

8/9/2015 12:15 PM

F1Rocket

Joined: 12/4/2012

Posts: 86

740 barometric instrument setting? Modified By F1Rocket on 8/9/2015 12:16:19 PM

How do you access setting the barometric pressure? I assume it is available to make the altimeter settings more accurate than a GPS altitude reading. I didn't find a reference to this in the manuals online.

8/9/2015 5:57 PM

Walter

Joined: 7/8/2009

Posts: 2778

Re: 740 barometric instrument setting?

Hi George,

GPSes, including the iFly GPS, automatically detect your True Altitude. Air pressure is not used in this calculation, it's pure triaguation based on the satelites. The only way to improve it's accuracy is to perhaps get an external GPS antenna so you can lock into more satellites.

Hope this helps,

Walter

Walter Boyd
President, Adventure Pilot

8/10/2015 11:53 AM

F1Rocket

Joined: 12/4/2012

Posts: 86

Re: 740 barometric instrument setting?

My question was about the "instrument" labeled - Altimeter. I have'nt flown with my new unit yet, so I am asking without knowing how this works and if it affects the MSL or AGL "instruments" that are available.

8/10/2015 12:26 PM

Joined: 1/1/0001

Posts: 0

Re: 740 barometric instrument setting?

It shows approximate altitude MSL based on triangulation using satellite data. It does not use air pressure information and will not agree with your airplane altimeter. When flying, you should use your airplane altimeter set to current barometric pressure. It might not be exactly correct, but all other aircraft are off by the same amount.

8/10/2015 12:48 PM

Walter

Joined: 7/8/2009

Posts: 2778

Re: 740 barometric instrument setting?

George wrote:

My question was about the "instrument" labeled - Altimeter. I have'nt flown with my new unit yet, so I am asking without knowing how this works and if it affects the MSL or AGL "instruments" that are available.

Ah, that instrument shows the pressure reading from the nearest metar. If you have an ADSB on board, that can be a handy reference to always know what your altimeter should be set to. But it does not have a way to manually enter anything, and it doesn't modify the GPS altitudes.

Thanks,
Walter

Walter Boyd
President, Adventure Pilot

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740 barometric instrument setting?

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