Bogus terrain warnings? - iFly Owners Q&A

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Bogus terrain warnings?

8/6/2012 8:45 PM

Don

Joined: 7/28/2012

Posts: 112

Bogus terrain warnings?

In 90 minutes of flying today, I had two occasions where the i720 was flashing terrain warnings because of an indicated descent rate of -97000 ft/min. I was in level flight at 150 knots. Has anyone else experienced this? I was flying in Indiana at 3000 ft msl.

Don

8/7/2012 7:13 AM

Cobra

Joined: 4/20/2011

Posts: 2602

Re: Bogus terrain warnings?

Were you near a waypoint in your flight plan?

I don't know what the latest software does with waypoints, but in early v7 betas, I saw behavior where if you were off from your planned altitude, the iFly would try to give vertical rate information to get you to cross your waypoint at the planned altitude. If you were very close to your waypoint, then of course your vertical rate would have to be very high to make the altitude change in time.

Once you're past that waypoint and on the next leg, the vertical speed guidance would go away until you were about to cross the next waypoint at the "wrong" altitude.

8/23/2012 11:25 AM

Walter

Joined: 7/8/2009

Posts: 2778

Re: Bogus terrain warnings?

This is on the bug list and will be corrected in the next release.

Walter Boyd
President, Adventure Pilot

8/24/2012 10:46 AM

dogbreth

Joined: 4/11/2011

Posts: 98

Re: Bogus terrain warnings?

yes, on a recent trip to Myrtle Beach, several times at 9000 ft the terrain warning started flashing...the first time it happened I was alarmed...but then just ignored it....

8/25/2012 12:25 PM

Brian

Joined: 9/7/2011

Posts: 4453

Re: Bogus terrain warnings? Modified By Brian on 8/25/2012 12:28:13 PM

Don, thanks for the report! I think I have fixed this issue, to be included in the next Beta 7.5.2 release (this week probably). I'd be surprised if dozens of other pilots haven't also seen this bug, but just haven't reported it yet. Thank you for this contribution.

In short, whenever we received an incomplete or corrupted GPS message, instead of just "ignoring it", we interpreted it as "0 msl" (default value). Since there will be occasional bad messages from GPS, this condtion is bound to happen.

The code for 7.5.2 is fixed. Now iFly just ignores the corrupted messages.

Brian Knox, Sr Software Engineer

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Bogus terrain warnings?

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