Regarding work experience, you may not get all the experience mentioned in the AMSA assessment letter. AMSA gave me 8 yrs, however when I submitted EOI I fell into 5-8 yrs category. This is because AMSA states the total work experience in the maritime industry, whereas DIBP calculates work experience in the last 10 yrs only.
Regarding qualification- AMSA assessment letter specifically mentions ''Austalian qualification equivalent for Ships Master, Chief Officers, Chief Engineers and 2nd Engineers is an Advanced Diploma and equivalent for Deck Watchkeeper and Engineer Watch keeper is Diploma. Requests for higher qualifications cannot be granted."