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Questions tagged [navaids]

Equipment which assists pilots in navigation, such as a VOR.

3
votes
1answer
42 views

What is the minimum separation for navaids to work properly without interfering?

What is the minimum separation between navaids (for VORs/DMEs and NDBs) for them to work without interfering, by regulation and by functionality?
0
votes
0answers
18 views

Ambiguous mention of NAVAIDs with duplicate names in FAA's CIFP file (ARINC-424 18 format)

I am studying FAA's Coded Instrument Flight Procedures (CIFP) dataset (link), coded in ARINC-424 18 format, and I noticed that navaids are coded for the purposes of an IFP simulation only by their ...
2
votes
0answers
126 views

How to calculate DDM in a ILS dual frequency system?

I'm working in a project where I have to process ILS baseband signals. I have no problem obtaining DDM value from single frequency signals, nor the individual components of a dual frequency signal (...
0
votes
0answers
57 views

Simulation tool/software for localiser and glidepath?

Anyone having a free simulation software for studying localiser,glidepath and DVOR signals? Softwares like ATOLL and LAGON but they are not free.
1
vote
1answer
357 views

Is it true that there are VOR/DME and/or TACAN stations in the oceans?

Are there any VORs placed in the oceans for navigation. Is it true that VORs or TACANs are placed on ships to help oceanic flights, for example flights across the Atlantic?
-7
votes
1answer
419 views

Do pilots of modern aircrafts still use maps, gps and compasses to find airports? [duplicate]

Do pilots of modern aircraft still need to navigate using maps, GPS and compasses to find airports? Alternatively do they use some sort of fully automated system that navigates the aircraft via ...
0
votes
1answer
741 views

What is the difference between a VOR and a VORTAC? [duplicate]

Confused about the difference between a VOR and a VORTAC?
5
votes
1answer
355 views

Where are US FIS-B UAT ground facilities located?

In the US there are Flight Information Services Broadcast (FIS-B) transmitters strategically located to provide WX, NOTAMS and other flight information utilizing the ADS-B infrastructure. ADS-B has ...
3
votes
1answer
2k views

What's exact offset degree dividing localizer and LDA?

When a localizer is offset at an angle with the runway track, it functions as a "Localizer Directional Aid or LDA." What's the exact offset degree dividing them? Any offset degree greater than 0 makes ...
7
votes
1answer
4k views

How does the ADF null positions find where the NDB is?

I understand how it operates for the most part, although I don't understand how the null positioning works. This image below doesn't include the sense antenna that limits it to one null position, ...
7
votes
1answer
3k views

What's the meaning of underlined frequency in sectional chart nav aid box?

There is a statement to describe the underlined frequency in legend, it says: Underline indicates no voice on this frequency. What does this mean? We still need to ident the Morse code, doesn't it?...
7
votes
1answer
11k views

What are the differences between a VOR and a VORTAC? [duplicate]

In Brazil airspace, we do not have VORTACs to navigate (unfortunately). That's why my doubts about accuracy, the range, the possible systems/frequencies they operate, and if there is any restriction ...
10
votes
3answers
10k views

How do you know if a VOR is High, Low, or Terminal?

Is there any way of telling on both a VFR and IFR chart what type of VOR we are looking at?
5
votes
1answer
401 views

Why would a VOR be decommissioned leaving the DME?

As can be seen on this question and this question the OJC VOR has been decommissioned but the DME is still active. What would be the purpose in having DME without VOR?
6
votes
4answers
157 views

How else can snowy/icy conditions disrupt airport operations?

In casey's fabulous answer here, he identifies several ways snow/ice can disrupt airport operations: Continuous heavy snowfall can eventually close an airport if it becomes impossible to keep the ...
7
votes
1answer
1k views

What does the crosshatching mean on this VOR-DME?

I noticed that the frequency of this VOR-DME is covered by crosshatching. The FAA chart guide says this "indicates shutdown status." What does this mean? Is this navaid being decommissioned?
9
votes
2answers
2k views

Why does a DME ground station wait 50 microseconds?

The FAA says that a DME ground station sends a response exactly 50 microseconds after having received an interrogation from an aircraft. For what reason is there a 50 microsecond delay?
8
votes
2answers
4k views

How are Victor airways defined and numbered?

I am wondering how Victor airways get determined. What determines how many 'segments' they are? For example some airways connect two VORs only, while other airways stretch across (or "connect the ...
17
votes
5answers
30k views

Where to find a waypoints/fixed points, navaids and airports database?

I wonder if it is possible to download a database with waypoints, navaids, airports and airways between them. I've been working with AIP documents but it's difficult to get raw information from them ...
26
votes
2answers
39k views

How does ILS (Instrument landing system) work?

How does ILS (Instrument landing system) work? I know it provides guidance to the runway by two signals, one modulated at 90 Hz, the other at 150 Hz, but how the airplane lock on those signals? ...
7
votes
2answers
867 views

What's the precision of a modern Inertial Measurement Unit, and how is it obtained?

This recent comment reports that: the IMU on new (plane) would localize the aircraft to within 3 feet after a cross-country flight, without any GPS input other than the starting location. I ...
23
votes
6answers
17k 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?
21
votes
3answers
4k views

How precise is an ILS (Instrument landing system)?

I read that an ILS is a precision approach system. It provides a final approach with precision in both horizontal and vertical guidance to the runways. But I don't know how precise it is because there ...