Questions tagged [navigation]

Navigation is the process of planning and controlling travel from one location to another. There are many methods of navigation using different techniques and instruments.

Filter by
Sorted by
Tagged with
1 vote
1 answer
235 views

Can this plane make it to an airport after dual engine failure?

If you are flying to the most remote airport(according to simple flying most remote airport is Mataveri International Airport), while flying on a typical airliner with normal weather, in the event of ...
Gabe's user avatar
  • 2,723
1 vote
1 answer
44 views

How can the derivative of the geodetic angles (lat, lon) be expressed by the Velocities in the NED-Frame?

I have found in the book "Unmanned Rotorcraft Systems" following expressions (eqn. 2.25 and 2.26). https://www.newbooks-services.de/MediaFiles/Texts/4/9780857296344_Excerpt_002.pdf $\lambda$...
Christian Mändle's user avatar
9 votes
5 answers
466 views

Do GPS coordinates of a fixed point in space ever change?

As I understand, GNSS uses the WGS84 model of the earth to pin-point points in 3D space. However, once the GPS coordinates of a point in space have been determined (say a GPS waypoint), do it's ...
PapaMike99's user avatar
2 votes
2 answers
283 views

Unusual pattern over English Channel

I have just spotted this Beechcraft flying an unusual pattern over the English Channel (late at night). It has no call sign etc. I'm thinking maybe a military aircraft looking for illegal migrant ...
Hew Williams's user avatar
-2 votes
0 answers
49 views

Glideslope Width measuring

I want to make an inspection of GP system before flight check. The idea is to measure the width of the sector (roughly) by going 200 meters from the GP  and using a lifting platform to measure the DDM ...
Momchil Graplyov's user avatar
8 votes
1 answer
191 views

ADIRU Mounting in Avionics Rack

If I understand correctly, navigational gyroscopes and accelerometers are located within the ADIRU boxes themselves. In order to initialise during aircraft startup, they must be mounted precisely ...
natanijelvasic's user avatar
0 votes
1 answer
107 views

What is the name of the dotted line that shows the predicted turn radius, found on the Navigation display of the 738

What is the name for the white dotted line that stretches out from the aircraft on the navigation display, when the aircraft enters a turn? It shows the aircrafts predicted flight path.
bok1942's user avatar
2 votes
1 answer
125 views

calculating TH,TC,MH,MC,CH,CC

...
Dan Nir's user avatar
  • 35
1 vote
1 answer
66 views

finding the approximate course change

I'm studying for my nav test (EASA ppl) I will be thankful for a good explanation solving this : ...
Dan Nir's user avatar
  • 35
1 vote
1 answer
131 views

Desired track for aircraft navigation

I am working on a flight planning application and I am need to calculate the desired track(DTK) of the current leg and upcoming legs of a entered flight plan. The formula and logic of solving that is ...
nabpp's user avatar
  • 11
1 vote
1 answer
137 views

Position Calls Relative to airport

Hey I’m a new student pilot to just trying to learn some new things here. I’ve been having trouble in recognizing and communicating my position with cardinal points relative to the airport in ...
DeadToMe 21's user avatar
0 votes
1 answer
67 views

ILS Frequency Assignment In Dual Nav Radio Setup

With a dual Nav radio setup (On autopilot panel) does the ILS frequency of the runway you're about touch down on need to be entered into both radios or just one? Cheers.
Seaharrier's user avatar
2 votes
2 answers
417 views

Is the GPS ground track true or magnetic?

This question arises from the Garmin GPS units (eg. GNS530 or GTN750), but the term ground track appears in a general context of GPS units so my question is also general. Is the ground track (TRK in ...
J.Lewandowski's user avatar
4 votes
1 answer
279 views

How to convert aircraft position from GPS to Local Tangent Plane (NED) coordinates?

Do these conversion formulas look correct? I'm writing my own local navigation script in Python, and I want to ensure that my understanding of the underlying math is solid. Reference location ...
Keith Blackstock's user avatar
2 votes
1 answer
188 views

How to fill out the Nav Log when reaching set heading point before the top of climb from the departure airport?

My current scenario is that I am flying from airport A to airport B. I need to reach 8000ft from sea level but it takes 22nm horizontally to reach that altitude and my first set heading point is 12nm ...
avidoni's user avatar
  • 21
7 votes
1 answer
477 views

Is it correct to say that the expected behaviour at a Fly-by/Fly-over waypoint derives from when there was no GPS, but rather just VOR/DMEs?

I was re-looking at Fly-by/Fly-over waypoints: and discussing with a colleague the topic of how these came about. Is it correct that this definitions were put in place so that a human pilot could fly ...
Federico's user avatar
  • 32.6k
1 vote
1 answer
575 views

Could "Lady Be Good" Incident Prevented by the Technology of its Time?

For those who don't know, Wiki page of the incident sums up. I don't have much knowledge about communication systems of WWII, but I know how radio communication work. This page has The aircraft flew ...
Lady Be Good's user avatar
4 votes
1 answer
1k views

How can I solve this question using the 1 in 60 rule?

What is the explanation for the question below in detail? A pilot is heading east and decides to fly to an alternate airfield which is 4NM south and currently 30NM from his present position. What is ...
Mango's user avatar
  • 185
15 votes
6 answers
8k views

Why don't planes (mostly airliners) primarily use GPS for navigation?

For the four airliners that I use in Microsoft Flight Simulator (A320neo, A319, A310-300, and 747-8I), I always have to align IRS and set up RAD NAV on the MCDU. Why can't we just use GPS? On the 747, ...
DaCuteRaccoon's user avatar
0 votes
0 answers
54 views

How many areas have RVSM being implemented worldwide?

The data provided by Eurocontrol and latest i could find is of 2003 from internet (source: https://www.slideserve.com/benjamin/cns-1207305 ). I wanted to know in how many areas still left where RVSM ...
Krishna Kanth's user avatar
5 votes
2 answers
2k views

How is TSO C145 equipment different from TSO C146 equipment?

From the AIM1-1-18 c1) C145 - "Airborne Navigation Sensors Using the GPS Augmented by the Wide Area Augmentation System" C146 - "Stand-Alone Airborne Navigation Equipment Using the ...
Name's user avatar
  • 886
13 votes
3 answers
3k views

Should turns always be standard-rate?

I know that the turn coordinator has markings that allow you to turn at a particular rate, so you can use the TC and a clock or stopwatch to turn a particular number of degrees. Are you always ...
Someone's user avatar
  • 7,097
4 votes
1 answer
291 views

What does it mean for a GPS PRN to be unserviceable?

There is a current NOTAM: !GPS 02/035 GPS Navigation PRN 28 unserviceable Feb 21, 2023 2020Z to May 31, 2023 2359Z What exactly does it mean for a GPS PRN to be unserviceable, and what significance ...
Chris's user avatar
  • 15.5k
3 votes
2 answers
243 views

Why do we measure translational accelerations but angular velocities in an IMU aircraft?

I am wondering why we measure for attitude of an aircraft its angular rate (instead of angular acceleration) and for the translational channel the acceleration instead. The computers can integrate ...
Kevin's user avatar
  • 31
3 votes
1 answer
465 views

When is it required to enter an airway? (IFR)

Assuming I'm not using a computer program to generate a flight plan for me, for cross-country IFR flight planning in the United States, how quickly after finishing departure procedures is one supposed ...
acker9's user avatar
  • 133
0 votes
0 answers
100 views

Why do they say PBN is under RNAV?

PBN exists under the umbrella of area navigation (RNAV). [FAA AIM, Section 2. Performance-Based Navigation (PBN) and Area Navigation (RNAV)] As far as I know, RNAV and RNP exist under PBN, and as an ...
rockybear's user avatar
  • 131
2 votes
3 answers
276 views

Can a commercial aircraft fly at night with complete navigation and communication equipment failure?

Disclaimer: I know there are numerous redundancies and the complete failure of navigation and communication system may not be possible. Hence, let's approach this question as a pure thought experiment....
Arpit Tyagi's user avatar
2 votes
1 answer
1k views

What is the difference between position and navigation lights on light training aircraft?

What is the difference between position and navigation lights on light training aircraft (or general)? When I search for both, I find the same lights: red on the left, green on the right, and white on ...
pilot162's user avatar
  • 2,195
-1 votes
1 answer
116 views

FMC and MCDU not talking

I have a test bed in which the FMC and MCDU are hooked up to one another. FMC menu was populated on MCDU and was able to be navigated. After making some changes to the FMC GPS #2 lines, the FMC ...
Ace's user avatar
  • 1
0 votes
2 answers
228 views

Why isnt the structure of the aircraft affected by high true air speeds or high ground speeds?

Let's suppose that in Cruise flight I exceed the VNE in TAS or in ground speed, why isn't the structure of the aircraft affected by the high speeds? I am sorry for my english, I am not a native ...
Andres's user avatar
  • 11
1 vote
2 answers
208 views

Communicating one's ground position by sighting an overhead aircraft (M*A*S*H)

In an episode of the 1980's television show M*A*S*H, several of the characters are stranded in the wilderness when their vehicle breaks down. In an attempt to communicate their position to any allies ...
John Gordon's user avatar
2 votes
1 answer
87 views

How can stand numbers 1, 2 and 3 have the coordinates of 07.9 minutes North ins, but stand number 9 have the coordinates of 07.8 minutes North?

How can stand numbers 1, 2 and 3 have the coordinates of 07.9 minutes North ins, but stand number 9 have the coordinates of 07.8 minutes North? As can be seen from the blue line I drew visually, ...
pilot162's user avatar
  • 2,195
0 votes
1 answer
321 views

Getting Minimum Grid Area Altitude from navigational chart

One of the questions for the EASA PPL(A) exam sounds like this: What is the highest Minimum Grid Area Altitude between BERTA (point 1) and LJLJ (Ljubljana) along route A (yellow)? And the following ...
Tudor Ravoiu's user avatar
0 votes
2 answers
1k views

Easy way to calculate distance between two GPS coordinates

I'm studying for my EASA PPL(A) exam, and for some questions for the Navigation exam, I'm requested to calculate the distance between two points, like so: What is the distance from VOR Brünkendorf (...
Tudor Ravoiu's user avatar
3 votes
1 answer
3k views

Understanding UNOS and exceptions from it

I'm studying for my EASA PPL(A) exam, and one thing that I came across are the following questions: Q: An aircraft in the northern hemisphere intends to turn on the shortest way from a heading of 270°...
Tudor Ravoiu's user avatar
0 votes
0 answers
178 views

GNS 430 Instrument Panel Self Test Page OBS readout does not agree with OBS Hdg selected on CDI

Our Newly installed Overhauled GNS 430 OBS readout on the Instrument Panel Self Test Page does not agree with the Heading selected on our CDI. Prior to the 430 overhaul they agreed perfectly. ...
Tunahawk's user avatar
0 votes
0 answers
4k views

Calculating True Course, Magnetic Heading and Compass Heading when Wind, True Heading, Magnetic Course and Deviation is known

I came across another exercise while studying for my PPL(A) exam where I would need some help with some calculations. The question sounds like this: Given: WCA: -012°; TH: 125°; MC: 139°; DEV: 002°E ...
Tudor Ravoiu's user avatar
5 votes
1 answer
218 views

How is rotational dynamics related to navigation?

I've been learning how to do dead-reckoning using just an ordinary IMU chip (a 3-axis accelerometer and a 3-axis gyroscope). In a number of textbooks I've read on aircraft navigation, the motion of a ...
KMC's user avatar
  • 193
-1 votes
1 answer
174 views

Calculation of density altitude

When using an e6b flight computer which temperature will I use with the pressure altitude to get the density altitude
Godsfavour's user avatar
4 votes
2 answers
169 views

How to determine QNH zones like New Zealand did?

I saw a file stating that New Zealand has 11 zones and was wondering how it was determined and divided, does anyone have any idea? the paper offers a short description that doesn't cover much ...
Zol613's user avatar
  • 41
7 votes
3 answers
2k views

How many channels does the VOR have?

VORs are assigned radio channels between 108.0 MHz and 117.95 MHz. How many channels are in-between? I guess that each decimal value represents 1 channel? for instance (108.1)(108.2)(108.3)(108.4)........
knowledgeloverx's user avatar
-4 votes
2 answers
151 views

How do VOR beacons detect?

I assume that any military aircraft can find the position to any VOR ground station. Is the VOR invisible to the military aircraft?
knowledgeloverx's user avatar
9 votes
1 answer
2k views

What is that green dashed circle on ND?

I think this is a navigation display from a boeing aircraft I searched around the internet for the meaning of the "green dashed circles" but got nothing. Thanks in advance for your answers!
yoyoyoyo's user avatar
0 votes
2 answers
865 views

What coordinates do helicopters (preferably) use?

There are different ways of representing coordinates. When I went to school, in geography class, we learned longitude and latitude as degrees, minutes, and seconds (like 52° 30' 59" N, 13° 22' ...
Maron's user avatar
  • 101
4 votes
4 answers
872 views

How can a plane or an object gimbal lock itself?

I've been trying to work out some rudimentary dead-reckonings with an IMU chip, and most of the kinetics/kinematics and algorithms are borrowed from aviation related textbooks. I understand what the ...
KMC's user avatar
  • 193
0 votes
1 answer
221 views

Is QDM displayed wrong for the VOR in the aircraft?

Clearly, the VOR signals follow a great circle track. Since, they follow great circle tracks, the track to the station, measured at the aircraft (either, true or magnetic), would be different due to ...
Sachin Chaudhary's user avatar
9 votes
2 answers
1k views

How were compasses in early interwar planes safeguarded against interference from flight?

I understand during the early days of flight that compasses were regarded as extremely unreliable and unfit for even basic navigation, but I'm unsure as to what caused this unreliability and what the ...
fishbed's user avatar
  • 103
1 vote
1 answer
148 views

Can a modern commercial passenger flight recover from failed sensor(s)? [closed]

ABC News reports a failure in a pitot tube sensor may be the cause of an AirFrance Rio to Paris flight tragedy. Excerpts from the news include: An Associated Press investigation at the time found ...
gatorback's user avatar
  • 357
1 vote
1 answer
449 views

Could Apple Airtags interfere with aircraft communication and navigation systems?

German media reports that Lufthansa has banned Airtags in checked bags: This is specifically because of the transmission function. Lufthansa claims that the transmission function needs to be turned ...
stevec's user avatar
  • 369
0 votes
1 answer
170 views

Confused about flight distance and flight time [closed]

I'm having a hard time understanding how the flight times of these flight are so different. I looked up PDX (Portland, Or) to DEN (Denver, Co) is roughly 923 miles, with a flight time of 2h30m to DEN ...
Erik Philips's user avatar

1
2 3 4 5
9