B2 High-Intermediate Other 276 Folder Collection
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number one Fairleads, Chocks, Bitts, Bollards and Dolphins Whaat??
Which is which?
So Fairleads have a roller attached to them, its purpose is to guide mooring lines.
Like these ones.
Chocks are structural reinforcements to direct the mooring lines to or from shore.
These guys are like hybrid roller fairleads chock, we call them roller chocks.
They are also used to guide mooring lines.
Bollards are mostly found ashore for securing mooring lines.
Sometimes you can also find them on ships.
Bitts are just double bollards, on my ship they are used for securing tug lines or fire
Dolhpins are well these guys .
Piles driven into the seabed to provide a platform or fixing point.
So from afar you'd think it's a beacon or buoy.
They can be used as moorings but for big ships I've never used them.
Second one is Chanel, Strait, and Canals
Strait is a narrow water body connecting two larger water bodies, such as Singapore strait
or strait of Gibraltar.
Most importantly , they are naturally formed.
Channels are simply much wider straits, like the English Channel
Canals on the other hand is man-made straits, artificial dug by humans.
Such as Suez Canal, Panama Canal.
Third Gulf and Bay
This one is quite confusing because the terminology is not defined.
Gulf is enclosed by two or more provinces or state or country and connected to another sea
Bay is still enclosed on 3 sides by land, but with a wide mouth that opens into the
ocean or another water body.
Most of them are circular or semi-circular Ie.
So you can have a small beach that is considered a bay,or something as large as Hudson Bay
Bay of Bengal is a big exception, even though
its way bigger than than gulf of mexico, its still considered a bay.
Fourth, Astern stern?
Abeam, beam?
Astern and Abeam are directions.
For example if the ship was moving backwards, I'd say engine's moving astern.
Stern without the a, is the aft end of the vessel.
abeam is 90degree looking out from the bridge and beam is usually the location perpendicular
to the bridge.
Fifth Tidal Stream and Current
They aren't the same thing.
Tidal Stream is as its name suggest cause by Tidal factors, ie rising and falling of
water level due to astronomical forces, mainly the moon.
So it can change throughout the day.
Current on the other hand is cause by wind and thermohaline aka temperature and salt
Sixth Weather-tight and Water-tight Door Weather tight doors are usually found above
the the main deck.
Watertight doors are under the water-line such as the ones in cargo hold.
Main difference is that watertight can handle heavy water pressure from both sides, say
for example submerged.
Weather Tight means it should not leak under heavy sea condition.
However the confusing part is that sometimes they look very similar.
Back when I was cadet I thought the spin wheel ones are watertight.
That's not always the case.
The only way to make sure is ofcourse by checking the general arrangement, aka blueprint of
the ship.
Seventh Gross Tonnage and Net Tonnage This one I always have trouble remembering,
its one of those things that I leave behind at school.
Gross Tonnage is the volume of all enclosed spaces on ship including Engine Room, Bow
thruster room, Stores, Accommodation etc.
While Net Tonnage is the cargo carrying spaces on the ship.
So its like measuring the money making capability of the ship.
Why does this matter?
Well a lot of port, anchorages and pilotage fees are calculated based on Net Tonnage.
So if you used gross tonnage you might be paying a lot more.
Eighth A Hitch?
A knot?
A knot is used to join two ropes together or a rope to itself.
If done correctly a knot will hold it shape regardless of it being fixed to something
A hitch is used to fix a rope to another object, such as a pole, and relies on that object
to hold.
Nineth Draft and Depth.
One of the port state control inspector came on my ship and asked what's the available
draft displaying on the ECIDIS, now obviously I didn't want to correct him and embarrassed
I knew he meant to ask whats the available depth in that area.
Depth is the how much available water there is, or how deep.
Draft is how deep the ship is sitting in the water.
Its one of those terms that just rolls off the tongue accidently sometimes.
Tenth one is Superstructure and Accommodation Structure
Superstructure is by definition a construction above existing structure.
So in shipping it is everything above main deck except any mast or sails.
While Accommodation well.. is simply only the living area.
A good example would be the monkey island and funnel.
It is part of the superstructure but not accommodation.
11th Derricks and Crankes This one I am not completely sure so if I
have it wrong, let me know in the comments down below.
A derrick's lateral and vertical motion is controlled by one set line and the lifiting
is done on a separate set of line.
Usually involve some sort of pulley system.
They are more stationary.
A crane main difference is that they have a lot more freedom to move around.
Mostly operates on gears and hydraulics.
Container gantry crane for example can move the base on wheels and move loads up down
left right anywhere, some can swing almost up to 360 only limited by limit switch.
12th Swinging Circle And Turning Cricle One of my cadets was confused about this one.
Swining Cricle is used in anchoring to draw out the limits, see my anchoring video here
A turning Cricle is the vessel's manoeuvring characteristics.
Simply put, it shows how the ship will behave when putting the wheel at hard over.
13th Gangways and Accommodation ladder.
Gangway are setup perpendicular to the ship, think cruise ships.
Accommodation ladders are are set up inline with the ship's length.
Can be used in conjunction with pilot ladders.
This is the one my ships always mix up, everyone including myself call our accommodation ladder
as gangway.
14th Capstan and Windlass On yachts or sailings boat, the two terms
can be interchangeable.
On larger commercial ships windlass has a horizontal axis, while capstan has vertical
15th Density and Specific Gravity This one is more for tanker people, which
I never worked on tankers but Density is mass over volume so think comparing
the difference between water and thick clay or cement.
Specific Gravity is a ratio of the density to the denity of another reference substance.
IF you are an engineer most likely you'd have to record it in the log book or something
after bunkering.
Let know in the comments below how many you know correctly, share with your sailor friends
and see how many they know.
Thanks for watching, see you next time.
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15 Nautical Terms Even Captains Get Wrong!?

276 Folder Collection
吳易晉 published on August 4, 2018
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