Quote Originally Posted by YoungMariner View Post
Emergency Anchorage is so vague because what emergency are we considering. If it’s an engine failure you have little choice where you will anchor. However you can identify areas unsuitable for anchoring such as over pipelines or underwater obstructions.
Some ports now provide passage plans and waypoints on their websites which can assist you in addition to the admiralty port approach guides.

UKC critical pilotage is a very complex area and has so many factors that would make it very hard for the ship to calculate itself without port/pilot guidance. Such information as the actual depths in the port, in a tidal port this can change significantly from day to day between dredging and can be a difference of tens of centimetres through to metres from the admiralty chart. Also due to variety of factors actual tide can vary significantly from the tidal prediction on the curves (0.7m is the largest deviation I’ve seen). Hence why safety margins and blanket rules of thumb are applied by most companies.
Ah that is very useful to know, so the only way for a vessel to calculate the worst case scenario of draft increase due to wave response would most likely be experience, from the formula it seems that with 1 degree of list for my vessel the draft would increase by around 38cm, usually the waves at most LNG terminals are pretty low(Since you also dont connect if the weather is bad) so I think even 1 degree of list might be a little too much.
Are there any good rules of thumb regarding this, like every x wave height=X degree of list for bigger merchant vessels assuming abeam direction?

And yeah the "emergency anchorage" is pretty vague, from past example i see it is usually just being used near port in case the port is closed due to bad weather or for some other reason or if the main anchorage is occupied

Quote Originally Posted by alistairuk View Post
Heel due to turn is usually included in the Vessels Stability Booklet - if your vessel is too old to have this, there is a generic formula that can be used for an approximation using the GM and such and I'm sure it's on the "Standard Formulas" that MCA/SQA use but I cant remember what it is at the moment - I remember finding it to do it for a ship I was on years ago.

On a side note your ships stablity software is possibly able to calculate this for your loaded condition and produce a nice graph as one of the report options.

Do you remember if heel due to turning has a different name in the stability booklet or in the stability software? I am on a 2007 built LNG carrier so it isnt that old but there are quite a few terms I am not really familiar with.(I ll have to check the stability software in case it has such options)

Also regarding that formula, are you referring to the one that calculates the degree of list based on the load conditions, GM etc? Because i am not sure how one would apply that to a moving vessel with X speed and X rate of turn (And i really dont remember any calculation that included those during my time in the maritime academy)

Anyway outside of that there are 2 other things I am looking for and havent found anything yet:
-Increase in draft due to the nature of the bottom(I have only heard that sand causes a slight decrease while solid bottom causes a slight increase in draft from someone but no proof or at least somekind of article)
-Increase in draft due to wind (I assume this is related to the stability booklet's standard wind lever calculation but i am not seeing any variables for wind speed or relative wind direction so i am not sure and most of my google searches show results regarding sailing vessels)

Quote Originally Posted by MrStealth View Post
This might not be what you're looking for, however...

Yeah i found this during some google searching, I assumed the same but i had a really big trouble understanding those formulas since i dont know what a few of the variables are or their unit of measurement.