Operating authority
Master 25 covers inspected passenger vessels up to 25 GT. For most commercial-tour-boat operators on inland lakes and rivers, this is the credential — Master 50 or 100 isn't needed unless the vessel is larger.
Master 25 GT — Small-Vessel Inspected Master
Master 25 GT authorises operation of inspected passenger vessels up to 25 gross tons. It is the smallest Master tier and the typical credential for inland sightseeing and small harbour-tour vessels.
TL;DR
Master 25 GT: 360 days sea service, full Master exam structure (including Plotting), authority over inspected vessels ≤25 GT. Often the credential for inland tour boats.
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