There are two basic types of SID: straight departures and turning departures. SIDs are based on track guidance acquired:
a) within 20.0 km (10.8 NM) from the departure end of the runway (DER) on straight departures; and
b) within 10.0 km (5.4 NM) after completion of turns on departures requiring turns.
Track guidance may be provided by a suitably located facility (VOR or NDB) or by RNAV. See Figure I-3-2-1.