In reference to the Bob Tait Instrument Rating Study Guide,
Question 31
You are planning an IFR charter flight in VH-OZY into an aerodrome for which no TAF is available. Select the requirement regarding the provision of an alternate for this flight -
Correct Answer (b) - no alternate is required providing the area forecast indicates no more then 4 eighths of cloud below LSALT + 500 feet and visibility not less than 8 km.
It also includes the answer explanation in the back,
31 - (b) - You can be sure that any aerodrome which has no TAF will have no instrument approach procedure other than a GPS NPA. Since a GPS NPA is ignored (actually says ingored in the book
) when it comes to planning an alternate, the requirements for no TAF are the same as the requirements for no approach procedure. AIP ENR 1.1 para 73.3
So hey I'm going to go with Mr. Tait on this one, but only because that was my understanding in the first place and his explanation has backed it up.