Originally Posted by
Basil
Interesting. Seems more codified than I recollect.
Now retired so, not that it matters to me, but:
Why 300' and not 500'?
300' is for greater than 10NM weather deviation required,
500' for other deviations requiring exiting tracks.
Must read the able vs unable to maintain altitude section carefully.
Also notice "should" vs must... I guess they wanted to give the PIC some leeway to be able to deviate from published procedure in case of fire/smoke etc..