rnav1 vs rnav2

[FE Hoppy]

and/or

So the specification is defined in the approval.

My quote is from the same doc.

RNAV 1 approval alone does not constitute RNAV 2 approval.

edit:

The specific differences between RNAV 1 and RNAV 2 approval is the use of Flight director or AP which MUst be used for RNAV 1 but not for RNAV 2 which may be flown using just a deviation display.