6.4.1 An aircraft provided with radar service should be informed of its position in the following circumstances:
a) upon identification, except when the identification is established:
i) based on the pilot’s report of the aircraft position or within one nautical mile of the runway upon departure and the observation is consistent with the aircraft’s time of departure; or
ii) by use of assigned discrete SSR codes or Mode S and the location of the observed radar position indication is consistent with the current flight plan of the aircraft; or
iii) by transfer of radar identification;
b) when the pilot requests this information;
c) when a pilot’s estimate differs significantly from the radar controller’s estimate based on radar observation;
d) when the pilot is instructed to resume own navigation after radar vectoring if the current instructions had diverted the aircraft from a previously assigned route, (see 6.5.5);
e) immediately before termination of radar service, if the aircraft is observed to deviate from its intended route.
6.4.2 Position information shall be passed to aircraft in one of the following forms:
a) as a well-known geographical position;
b) magnetic track and distance to a significant point, an en-route navigation aid, or an approach aid;
c) direction (using points of the compass) and distance from a known position;
d) distance to touchdown, if the aircraft is on final approach; or
e) distance and direction from the centre line of an ATS route.
6.4.3 Whenever practicable, position information shall relate to positions or routes pertinent to the navigation of the aircraft concerned and displayed on the radar map.
6.4.4 When so informed, the pilot may omit position reports at compulsory reporting points or report only over those reporting points specified by the air traffic services unit concerned, including points at which air-reports are required for meteorological purposes. Pilots shall resume position reporting when so instructed and when advised that radar service is terminated or that radar identification is lost.
6.5 Radar vectoring
6.5.1 Radar vectoring shall be achieved by issuing to the pilot specific headings which will enable the aircraft to maintain the desired track. When vectoring an aircraft, a radar controller should comply with the following:
a) whenever practicable, the aircraft should be vectored along routes or tracks on which the pilot can monitor the aircraft position with reference to pilot-interpreted navigation aids (this will minimize the amount of radar navigational assistance required and alleviate the consequences resulting from a radar failure);
b) when an aircraft is given a vector diverting it from a previously assigned route, the pilot should be informed, unless it is self-evident, what the vector is to accomplish and, when possible, the limit of the vector should be specified (e.g. to ... position, for ... approach);
c) except when transfer of radar control is to be effected, aircraft shall not be vectored closer than 4.6 km
(2.5 NM), or, where a radar separation minimum greater than 9.3 km (5 NM) is prescribed, a distance equivalent to one half of the prescribed separation minimum, from the limit of the airspace for which the radar controller is responsible, unless local arrangements have been made to ensure that separation will exist with radar-controlled aircraft operating in adjoining areas;
d) controlled flights should not be vectored into uncontrolled airspace except in the case of emergency or in order to circumnavigate severe weather (in which case the pilot should be so informed), or at the specific request of the pilot; and
e) when an aircraft has reported unreliable directional instruments, the pilot should be requested, prior to the issuance of manoeuvring instructions, to make all turns at an agreed rate and to carry out the instructions immediately upon receipt.
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