According to OPS regulations, the minimum required navigational equipment is as follows for operations under IFR or VFR along routes not navigable by reference to visual landmarks…
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A
GPS for low-level flights; one area navigation equipment If the flight is to be flown, requiring area navigation; and one VOR receiver.
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B
One VOR receiver; and one area navigation equipment If the flight is to be flown requiring area navigation.
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C
Two VOR receivers if the route is to be flown using VOR navaids only; two NDB receivers if the route is to be flown using NDB navaids only; and one GPS for low-level flights.
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D
Two VOR receivers if the route is to be flown using VOR navaids only; two NDB receivers if the route is to be flown using NDB navaids only; and one area navigation equipment if the flight is to be flown requiring area navigation.
ED Decision 2014/015/R - AMC2 CAT.IDE.A.345 Communication and navigation equipment for operations under IFR or under VFR over routes not navigated by reference to visual landmarks
ACCEPTABLE NUMBER AND TYPE OF COMMUNICATION AND NAVIGATION EQUIPMENT
(a) An acceptable number and type of communication and navigation equipment is:
(1) one VHF omnidirectional radio range (VOR) receiving system, one automatic direction finder (ADF) system, one distance measuring equipment (DME), except that an ADF system need not be installed provided that the use of ADF is not required in any phase of the planned flight;
(2) one instrument landing system (ILS) or microwave landing system (MLS) where ILS or MLS is required for approach navigation purposes;
(3) one marker beacon receiving system where a marker beacon is required for approach navigation purposes;
(4) area navigation equipment when area navigation is required for the route being flown (e.g. equipment required by Part-SPA);
(5) an additional DME system on any route, or part thereof, where navigation is based only on DME signals;
(6) an additional VOR receiving system on any route, or part thereof, where navigation is based only on VOR signals; and
(7) an additional ADF system on any route, or part thereof, where navigation is based only on non-directional beacon (NDB) signals.
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