Draft survey use to be carried out on bulk cargo and normaly done according to the request of

seller, buyer , charterer, shipowner, P&I club, superintending company …..etc.
draft survey normally done to determine cargo loaded on the vessel by checking all necessary
calculations prior laoding and the same calculations af at the the discharging port to confirm the
quantity discharged.
UIS  can surely calculate the Draft Survey by its inspectors or by Sub-Contactors.