Another question

[landaftaf]

the standards for colour recognition in the m.n. is done by a simulated lantern test - and needs 100% sucess rate in being able to identify an oil lamp at 5 miles - so I am intrigued to know what criteria are you using ?
my earlier post gave the official answer about buoys (and navigational marks in general) at night
my earlier post gave an opinion on when one could expect to sight a buoy in daylight.
this is on the assumption we are talking about standard size iala and cardinal buoys.
what are you refering to ?

 

[Lee_Shaw]

Hehehehehe - everyone's on about lights. If you read the question he specifically says a bouy in daylight .

Sorry to laugh.

Ahem! To answer your question, it all depends on the intensity of the light and the height of the observers eye above sea level.

/forums/images/graemlins/tongue.gif

 

[cod]

Not forgetting the height of the light.

MINESAPINT.

 

[Cornishman]

I was quoting the RYA answer to the question posed in the RYA Day Skipper exercise paper, which was what was being asked here.

 

[landaftaf]

ahah - the staff answer ........ good to know to pass the exam, the truth is often a suprise

/forums/images/graemlins/shocked.gif

 

[bilbobaggins]

While they're all the same height on the chart, they're all different at sea.

Although I know - from 35+ years sailing around there - exactly where to look for The Manacles East Cardinal, I never seem actually to spot it until I'm well less than half-a-mile.

 

[cod]

There is no chance I will be going down to Braye to do a visual on this buoy but will someone put it in their diary and report back.

MINESAPINT.

 

[Stevie_T]

With respect Talbot the question is actually quite simple /forums/images/graemlins/wink.gif and here it is again
[ QUOTE ]
Daylight/Good visibility. Entering Braye. At what range would you expect to see the green NO1 buoy?

[/ QUOTE ]

Everyone keeps going on about night and dark and visibility of lights, the question clearly states Daylight/Good visibility!

And I would agree that the distance is not very far, out in open Sea with a large buoy maybe a couple of miles, a smaller buoy probably a mile, with land behind maybe half a mile or less.

 

[Talbot]

talking at slight cross purposes. I was trying to answer the light part brought up by other answers.

Part of my answer is still valid. The height of eye, and height of the buoy are still important to get distance - but again this assumes a flat calm day. Thus max distance is about 3.5 nmiles (flat sea and 20-20 vision and binoculars)

 

[cod]

When I spotted this question I thought it would be interesting to put it to the forum.

We still need a visual. Any offers.

MINESAPINT.

 

[Stevie_T]

Well, the answer kind of depends on where you are approaching from. If you have just come North up the Swinge, then you will not see it until you have rounded the breakwater.
There is of course no requirement to spot it early as there are plenty of other navigational aids until you enter the harbour from any direction.
However if you are heading in from the North I would say again about 0.5 Nm

 

[cod]

I agree more or less with your line of thinking. The thing is the RYA answer is apparently you should make out the shape at 2M and be able to identify the colour at 1M.

It must be an enormous buoy or I need to change my optician.

MINESAPINT.