In ICAO's 8160 "Aircraft Operations" manual there is a term called "track guidance", for which I can not find any clear definition.
A few examples:
Departure Procedures 3.1
3.1.1 There are two basic types of departure route: straight and turning.
3.1.2 Track guidance shall be provided:
a) withing 20.0 km (10.8 NM) from the departure end of the runway (DER) for straight departures; and
b) within 10.0 km (5.4 NM) after completion of turns for turning departures.
3.1.3 Surveillance radar may be used to provide track guidance.
3.2.2 Types of Straight departure
b) straight departure with track guidance:
1) facility ahead or behind; and
2) offset (track parallel/track offset/track crossing).
1.6 TRACK GUIDANCE
1.6.1 Track guidance should normally be provided for all phases of flight through the arrival, initial, intermediate, final and missed approach segments. When track guidance is provided, the appropriate segment shall lie within the established coverage of the navigation facility on which the track guidance is based.
Judging from the context in which track guidance is mentioned, I would say that it refers to conventional navaid-based procedures, where the aircraft needs navaid facilities in order to keep on track.
All things considered, does the term track guidance have any meaning for RNAV/RNP procedures? Are RNAV/RNP procedures considered procedures without track guidance?
Any clarification would be appreciated.