Questions tagged [gnss]

GNSS is a global satellite navigation system. GPS is the US GNSS.

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4
votes
1answer
3k views

Do real aircraft have something close to the GPS/NAV modes in FSX?

I am a long-time flight simulator player and also very interested in aviation. In FSX, all aircraft have a GPS/NAV knob which allows the pilot to switch between direct GPS autopilot and VOR navigation ...
5
votes
2answers
293 views

Is the Bendix/King KMD-550 airplane icon always oriented to the north?

I have a 2001 Cessna 182T with King avionics. The KMD-550 moving map display correctly shows "track up" but the little airplane icon is always pointed to the north. How can I set this so that it ...
7
votes
3answers
4k views

Why don't airliners have a navigation GPS as back up in case of a pitot tube malfunction? [duplicate]

Why don't airliners have a navigation GPS as "back up" in case of a pitot tube malfunction? Aeropero 603 and Air France 447 plus many other im sure, could have been saved if these aircrafts would have ...
4
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2answers
349 views

KIBM RNAV (GPS) 10 -- did I find a charting error, or what is the TERPS rationale for this?

I was looking at the RNAV (GPS) approach to runway 10 at Kimball, NE (KIBM): and was left wondering "How on earth could the straight-in visibility minima for approach categories C and D be lower than ...
7
votes
2answers
7k views

What is the benefit of having baro-VNAV in addition to a WAAS GPS?

On Cirrus' 2015 aircraft page, they advertise Baro-VNAV capability in the new model. Having never done an LNAV/VNAV GPS approach (only LNAV or LPV), I'm wondering: when would I actually use it, if I ...
7
votes
2answers
8k views

Can I use an expired IFR-certified GPS with an out of date database in lieu of DME?

I know I should update the database in my GPS, but nevertheless I'm wondering if i can use an expired IFR-certified GPS with an out-of-date database in lieu of DME
37
votes
9answers
46k views

"Airplane mode" does not disable GPS... is it safe to use GPS in flight?

I noticed that even when my phone is in "airplane mode", I can still use the GPS. Theoretically a GPS receiver just receives data, so I guess it would not jam anything. On the contrary, on the ...
7
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2answers
1k views

Can a GPS signal sent to a plane be spoofed?

Related to What effect would an air-to-air GPS jamming system have?, I'm wondering whether it is possible for a terrorist (or likewise, law enforcement) to manipulate GPS signals received by a jet, re-...
7
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1answer
629 views

What effect would an air-to-air GPS jamming system have?

I just noticed an interesting AIC: NOTIFICATION OF GPS JAMMING EXERCISE – HEBRIDES RANGES DURING PERIOD 21 JULY - 1 AUGUST 2014. PDF available on Eurocontrol (official) or Scribd (mirror). The ...
17
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4answers
20k views

Is LPV considered a precision approach?

WAAS LPV approaches can have decision altitudes as low as 200 AGL, the same as many Cat I ILS approaches. Previous opinions on the Internet have quoted the FAA as saying LPV is considered a non-...
20
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5answers
10k views

Why is there a difference between GPS Speed and Indicator speed?

I just played with flight simulator and noticed that the GPS shows different speed from the speed indicator in the cockpit. Also, GPS speed is higher than the Indicator. Any Idea why?
12
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3answers
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Could the GPS be used to aid the autopilot with speed?

In the AF447 incident, the autopilot system was offline due to the aircraft's pitot tubes being obstructed by ice particles. Since the physical condition of the plane in air is cold and risky, the ...
31
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6answers
20k views

How do airliners cross the ocean without GPS?

How do airliners cross the ocean without GPS? Do they use dead-reckoning or are there navigation aids floating out there?
43
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12answers
32k views

Why don't all commercial aircraft transmit GPS data in real time?

It seems strange that trucks and taxis can be set up to transmit GPS data in real time but aircraft cannot. Wouldn't this be a useful function and feasible to implement?
28
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6answers
16k views

Is it possible for a modern commercial airliner to stop being tracked without substantial mechanical failure?

I was speaking to someone about the MH370 incident, and they suggested that a hijacker could turn off the device that sends the plane's current position, resulting in the appearance of a catastrophic ...
12
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1answer
3k views

How do I tell a Garmin 430 not to exit a hold?

Let's say that we're directly west of CATLI and have been cleared direct CATLI for the RNAV approach. We load the approach into ...
8
votes
1answer
2k views

How do aviation GPS navigation systems report GPS accuracy?

While looking over a tutorial on how to operate the Garmin GNS430, I couldn't find any info on how the device would report a degraded or low accuracy signal. What are the accuracy requirements for ...
8
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3answers
2k views

How is GPS RAIM availability calculated?

I recently had someone ask me if there was a GPS RAIM availability calculator available for the iPad. There isn't, but it got me thinking that I could write one. After doing some searching, I can't ...

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