coastal or off shore

Discussion in 'All Things Boats & Boating' started by wavepropulsion, Aug 19, 2015.

  1. wavepropulsion
    Joined: May 2010
    Posts: 91
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    Location: Uruguay

    wavepropulsion Pirate Member

    Hello, I need some help.
    Somebody can tell me please what's the difference of a design classified as 'coastal' or 'off shore'?
    I was searching in Selway Fisher website and some boats are classified this way, Can be a help or a guide other than a rule? I seen that with similar carachteristics, the wider boats are considered off-shore and the narrower coastal by the designer.
    I understand 'inland waters' and 'estuary' but other than the ability to ride big swells I believe coastal can be more demanding than off-shore.
    I was considering his Avon 22 and Power 2(both 'coastal') , I believe that boats are more efficient than his Power 1.3 classified as off-shore (this has a little rocker in the forefoot and is very wide).
    Thank you all and sorry if the question is too silly. But the designers by taging theyr boats sometimes create or erase a market and makes me have some doubts.
     
  2. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    If you are using classification society rules, the definition of each area of operation is clearly given at the beginning. It is not consistent across different Class societies either.
     
  3. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    It depends on the location. For example, in the USA there are no legal distinctions between offshore and inshore. Uruguay has more regulations and require regular inspections even for recreational boats.
     
    1 person likes this.
  4. Ad Hoc
    Joined: Oct 2008
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    Location: Japan

    Ad Hoc Naval Architect

    As noted above, if you are using Classification society rules, each has their own definitions of onshore offshore etc. This is also true for Flag sates - those that issue the permits to operate, such as USCG in the US or MCA in the UK etc.

    Here is DNV's:

    DNV area limits.jpg

    and here is LR's:

    LR area limits-1.jpg LR area limits-2.jpg

    Take your pick...
     
  5. wavepropulsion
    Joined: May 2010
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    Location: Uruguay

    wavepropulsion Pirate Member

    Thank you very much. So I understand this classification does not affects the seaworthiness of the boats, but follow standards for legal purposes. I'm right?
    I intend to build in Brazil where the rules are more permissives, and my doubt was about the capabilty of the hulls to manage swells and weather.
    Nice to see your answer Gonzo, I follow some of your comments and I seen pictures you posted from where you gillnetted here. Fisheries still being lost in this country because the marine wolves and some foreigner furtives fishing with explosives in the east, lack of strategyes,etc..
    Ad Hoc, the boats I choice are because the similarityes with some japanese boats, I found plans for a traditional one but before modifying it I consider better to buy plans. Thank you, I still reading your attachements.
     
  6. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    That, said by this way, directly, without further explanation, it is amazing. I would like further explanation, to understand how regulations in the US may have such large loopholes. Perhaps I have misunderstood.
     
  7. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    There are no loopholes, there is no existing regulations for recreational vessels. It is up to the master to decide whether the vessel is adequate or not.
     
  8. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    Thanks, really, for your explanations but you did not talk of regulation for recreational vessels but of "legal distinction". That is the nuance that has caught my attention. And the master, what he bases this decision, which can endanger human lives?
    Perhaps my professional bias prevents me to understand that there can be such a great freedom to design boats. Excuse my ignorance and thanks again.
     
  9. wavepropulsion
    Joined: May 2010
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    Location: Uruguay

    wavepropulsion Pirate Member

    Under my little experience, the more developed the country the less the regulations . Actually I'm in a country with much regulations (you must register a kayak here and must have a license ), specially about the electronics and other implements on board. But I been in Australia and Europe sailing too.
     

  10. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    I grew up in Uruguay. The regulations are overwhelming.
     
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