Originally Posted by Dry_Doc
I'm struggling to find definitive info about coding requirements for non-passenger boats operating commercially in cat c waters.
Are they covered by MGN280 or do they come under the MSN1823 (even though they're not carrying passengers)?
The boat in question is a 4m plastic tender to be used for survey/electric fishing work in rivers.
‘Inland waters’ includes any area of water not categorised as ‘sea’ - eg canals, tidal and non-tidal rivers, lakes, and some estuarial waters (an arm of sea that extends inland to meet the mouth of a river).
Inland waters are classified as one of four categories:
Category A - narrow rivers and canals where the depth of water is generally less than 1.5 metres
Category B - wider rivers and canals where the depth of water is generally 1.5 metres or more and where the significant wave height could not be expected to exceed 0.6 metres at any time
Category C - tidal rivers, estuaries and large, deep lakes and lochs where the significant wave height could not be expected to exceed 1.2 metres at any time
Category D - tidal rivers and estuaries where the significant wave height could not be expected to exceed 2 metres at any time
These categorisations determine the waters not regarded as ‘sea’ for the purposes of most Merchant Shipping legislation, except that, for marine pollution legislation, ‘sea’ normally includes any estuaries or arms of the sea, and therefore tidal Category C, and Category D, waters.
Water categorisation policy and processes are dealt with by MCA.
Link to locations -- https://mcanet.mcga.gov.uk/public/c4...s/view_all.asp
Hope that helps as a start, may need to research a bit more for you