Question

Does the 30 nm limitation only apply to the position fix using 2 NDB's? or Would a radio fix using an NDB and DME be acceptable? or an NDB and VOR, etc... ?

a) 30 nm limitation only applies to 2 NDBs
b) Radio fix using NDB and DME is acceptable
c) NDB and VOR are not acceptable for fix
d) No limitations on fix methods

Answer 1

The 30 nm limitation applies to using two NDBs for position fixes but using an NDB in combination with DME or VOR is acceptable and can provide reliable fixes beyond this range, as they can overcome the limitations associated with solely using NDBs.

Step-by-step explanation:

The 30 nm limitation is specifically related to a position fix using two Non-Directional Beacons (NDBs). While using two NDBs for fixes beyond 30 nm may not be considered reliable due to the inherent characteristics and limitations of NDB signals, other navigational aids can be used in combination to obtain a more accurate fix at greater distances.

For instance, a position fix using a combination of an NDB and Distance Measuring Equipment (DME) is acceptable and can provide accurate distance measurement from a VOR/DME station or a standalone DME station, thus overcoming distance limitations associated with solely using NDBs. Similarly, using an NDB and a VHF Omnidirectional Range (VOR) together can also yield a reliable fix, as VOR provides azimuth information which, when paired with an NDB's non-directional signal, can give a precise fix location. Therefore, the correct answer here would be that using an NDB in conjunction with DME or VOR is indeed acceptable, and there are no strict limitations regarding the combination of different types of navigational aids for fix methods, as long as they are used within the equipment's operational specifications and coverage.