Carrying Iron Ore - Ships Nostalgia
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Carrying Iron Ore

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  #1  
Old 7th March 2010, 11:50
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Carrying Iron Ore

You may think these question to be very basic, and I may already have an inkling of the answers.

When an ore carrier loaded or discharged her cargo of iron ore, would a compass correction need to be made each time?

I think the answer would probably be 'yes, of course', but from my memory from College, this would require the ship to be turned in full circle (?) for adjustments to be made.

What if the cargo shifted, would that make any noticeable difference?

What exactly would the process be?

Thanks for your time
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  #2  
Old 7th March 2010, 11:58
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Greetings,

The process, make sure the gyro was working properly.
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  #3  
Old 7th March 2010, 12:30
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I used to work on Iron Ore Ships.
The reality was we never adjusted compasses for each trip . Yes there is a huge difference between loaded and empty ....... Just keeping a good compass record book , doing an error each watch is a VERY GOOD IDEA ......for the day the gyro falls over!
Its not just iron ore of course......... pipe carriers in the offshore game also experience large amouts of deviation........Remember : True Virgins Make Dull Company ( True, Variation,Deviation, Compass)
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  #4  
Old 7th March 2010, 13:11
John Cassels John Cassels is offline  
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Sailed on many ore carriers both large and small and never seen any of the ships swung
because of this.
Think Nick has the answer ; keeping a good compass error book was important when
both loaded and in ballast. Easy then to compensate if required.
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  #5  
Old 7th March 2010, 13:34
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Quote:
Originally Posted by Nick Balls View Post
Remember : True Virgins Make Dull Company ( True, Variation,Deviation, Compass)
Thanks for the quick responses

it makes sense now. I had forgotten about the gyro's - must be getting old!!

Nick I remember that phrase! We were also taught the clean version - Cadbury's Dairy Milk Very Tasty.
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  #6  
Old 7th March 2010, 14:14
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Been on more than one ship where we 'lost' the Gyro............The best one was when we had been having trouble with a Microtechnica Compass and had a new element sent out to Japan from italy....... There she sat on the Chart Table in special wooden blocks ,ready to be fitted .Along comes the Junior engineer and gives it a quick 'roll' across the table...........We hand steered that trip right across the pacific ........ LOL
I have had to give up now but more recently I have been appalled at the lack of attention paid to the compass record book !!! I was still teaching youngsters the ease and speed of getting good errors ....WITHOUT a damm calculator ....and in some cases on modern ships which frequently now have very poor quality Magnetic compasses and no repeaters , using the ship itself to align a suitable observable object.. That is the big trouble , people forget that Navigation is an art not a science !
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Old 7th March 2010, 14:53
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All,
At the risk of repeating myself Weir's Star Diagram for the most satisfying way of obtaining Compass Errors and Deviations.

Yours aye,


slick
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  #8  
Old 7th March 2010, 17:19
greektoon greektoon is offline  
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Quote:
Originally Posted by jaydeeare View Post
Thanks for the quick responses

it makes sense now. I had forgotten about the gyro's - must be getting old!!

Nick I remember that phrase! We were also taught the clean version - Cadbury's Dairy Milk Very Tasty.
And the mnemonic for going from Compass to True.... (Compass Dev Mag Var True) .....


Charlies Dick Makes Virgins Tremble
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  #9  
Old 7th March 2010, 17:40
TIM HUDSON TIM HUDSON is offline  
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Sailed on the iron ore carriers of BISCO chartering and never remember the cargo shifting. The heaps were where they were loaded despite some awful passages from Murmansk or St. Lawrence.
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Old 8th March 2010, 09:32
michaelF michaelF is offline  
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Quote:
Originally Posted by greektoon View Post
And the mnemonic for going from Compass to True.... (Compass Dev Mag Var True) .....


Charlies Dick Makes Virgins Tremble
The one i always used was

Cadets Don't Meet Virgins Twice

mike
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  #11  
Old 8th March 2010, 09:59
trotterdotpom trotterdotpom is offline  
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Nick Balls: "Been on more than one ship where we 'lost' the Gyro............The best one was when we had been having trouble with a Microtechnica Compass and had a new element sent out to Japan from italy..."

I bet that was an SD14.

John T.
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  #12  
Old 8th March 2010, 10:28
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Yes the London Grenadier ...........I always thought this system was a great idea but they were just useless things !!!!! It was not until I got in the offshore game that I came across the best.......Arma Brown ..... The most indestructible bit of kit ever!
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  #13  
Old 8th March 2010, 21:44
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Quote:
Originally Posted by Nick Balls View Post
Yes the London Grenadier ...........I always thought this system was a great idea but they were just useless things !!!!! It was not until I got in the offshore game that I came across the best.......Arma Brown ..... The most indestructible bit of kit ever!
Yes I agree with you Nick, but the early Arma Brown models were not without problems. On one ship in cold weather up the fiords in winter, the low temp warning light would come on. We would have to wrap soft expended paper (used for protection of radio valves) around the compass and the light went out once heat was regained The compass was on the chart table and the header tank for the central heating was in the funnel but below the height of the chartroom radiator. Brown's told us that they were fitted in Nato tanks.
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  #14  
Old 10th March 2010, 09:34
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Yes thats right it was a tank compass. I worked on one small supply boat with this type of compass and it had been running non stop for well over 10 years in extremely rigorous conditions without ever being touch ! Having persuaded the super that it needed a service the chap who came down was simply amazed that the thing was still going !!
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  #15  
Old 19th March 2010, 18:04
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Apart from Iron ore cargoes the same applied to Pig Iron , and any other cargo with a good iron element -As hyas been said a good and well kept Compass Correction Book always helped should the Gyro trip .
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  #16  
Old 20th March 2010, 16:33
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Thanks again for all this information
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  #17  
Old 6th May 2010, 20:29
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CERTELMELC
Compass to true - E'ly to right
True to Magnetic- E'ly to left
Magnetic to Compass - E'ly to left
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  #18  
Old 6th May 2010, 21:54
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Error East Compass Least
Error West Compass Best
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  #19  
Old 30th June 2010, 18:08
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What are the two iron balls on either side of bridge compass? They can be adjusted.
Do these compensate for iron ore cargoes.
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  #20  
Old 30th June 2010, 19:03
Billieboy Billieboy is offline  
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Quote:
Originally Posted by michael charters View Post
What are the two iron balls on either side of bridge compass? They can be adjusted.
Do these compensate for iron ore cargoes.
The story is that they came off the monkey, who was living on the island, when the ship got stuck in the ice.
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  #21  
Old 30th June 2010, 23:52
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The story is that they came off the monkey, who was living on the island, when the ship got stuck in the ice.
VERY FUNNY
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  #22  
Old 1st July 2010, 02:46
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Stupid me! I always thought they were Kelvin's balls!
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  #23  
Old 1st July 2010, 12:06
Wanstead Wanstead is offline  
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Quote:
Originally Posted by michael charters View Post
What are the two iron balls on either side of bridge compass? They can be adjusted.
Do these compensate for iron ore cargoes.
No! They correct a Coefficient 'B'
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  #24  
Old 1st July 2010, 15:41
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Great thing magnetism. sail the seas with only a loadstone!
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  #25  
Old 1st July 2010, 15:54
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It's leckey's de-gaussing that screws it all up!
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