Friday, March 9, 2012

Is there any way we can do dead reckoning using just ADF needle?

If all other instruments fails which is highly unlikely can we find our position,speed and distance using just ADF needle? if yes HOW? could you please explain in detail thanks a lotIs there any way we can do dead reckoning using just ADF needle?
ADF navigation is still part of the I/R Instrument Rating theory and practice -
I understand they decommissioned NDBs in USA -
But the rest of the world still use them -

For tracking inbound - QDM -
Head to the station and assume a drift correction (if any L or R) -
Basically use the 12 o'clock position on a fixed card or RMI -
For tracking outbound - QDR -
Basically use the 6 o'clock position and compute drift (L or R) -

Distance to station NDB (also works with VOR) can be done -
Copy the following notes -

(1) ADF/VOR wingtip bearing change =
On 10潞 bearing change, each 10 seconds time = 1 minute to station -

(2) ADF/VOR bow to beam bearing =
Relative bearing 045潞 to 090潞 or 315潞 to 270潞 time in seconds =
Equals time to station in seconds -

To compute distance, NDB stations do not include DME -
You could use radio stations (150 kHz to 1650 kHz) if you know their location -

I flew the North Atlantic, ADF could get BBC 200 kHz from 2,000 NM away...!
If everything failed including compass - you could reach England using the ADF -
.
.Is there any way we can do dead reckoning using just ADF needle?
Dead reckoning is navigation without any references to outside sources of information at all, so, strictly speaking, if you are using ADF or any other external navigation aid, it's not dead reckoning.

Dead reckoning means that you start at a known position and then determine subsequent positions by integrated all the movements of the vehicle. This is extraordinarily difficult for a human pilot, but inertial navigation systems do this every day. An INS is intialized with a precise position on the ground, and it then detects every single movement of the aircraft with great precision in order to develop updated fixes without any external references. That's what makes an INS handy for crossing oceans.

It's possible to use dead reckoning by hand in ground transportation, but it's much more difficult on water or in the air, because of unknown water or air currents.Is there any way we can do dead reckoning using just ADF needle?
Yes, it is possible to approximate your position. Go here and scroll down to Page 5-2 near the bottom: http://www.casa.gov.au/wcmswr/_assets/ma鈥?/a>

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