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Old 06-09-2010, 21:28   #1
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Question ID This Buoy: Fl R 2.5s 8ft "2"

So it's flashing red at 2.5 seconds, and has a "2" on it. It's a light, stamped into the mud on a pole I imagine.

The 8ft... is that height over mean high tide?

Studying for oupv.
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Old 06-09-2010, 21:43   #2
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Okay, one more. These are two lights mounted on a (Zuniga) jetty when entering San Diego harbor. They're on your starboard side, outside the channel.

Fl 2.5s 28ft 6M Horn Z : I'm guessing flashing white 2.5s, 28 feet above mean high tide, with a horn, daytime you can spot the Z.

Next further to leeward:

Fl 4s 18ft 5M Y : Marked with a Y, flashing white 4s, 18 feet above mean high tide.

On both: The "M" is mileage the light is visible, as in 6 (then 5) nautical miles?
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Old 06-09-2010, 22:24   #3
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Okay, one more. These are two lights mounted on a (Zuniga) jetty when entering San Diego harbor. They're on your starboard side, outside the channel.

Fl 2.5s 28ft 6M Horn Z : I'm guessing flashing white 2.5s, 28 feet above mean high tide, with a horn, daytime you can spot the Z.

Next further to leeward:

Fl 4s 18ft 5M Y : Marked with a Y, flashing white 4s, 18 feet above mean high tide.

On both: The "M" is mileage the light is visible, as in 6 (then 5) nautical miles?
You're doing fine with most of those except the last letters. If the light were marked with a letter or number it would be in quotes.

Y probably means yellow, it's the only meaning I could find in Chart 1.

The Z is harder. It follows the horn so I would expect it to be something about the horn. It might be that the horn blows morse code Z but I would expect the Z to be in parentheses.

Luck with the test.
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Old 06-09-2010, 22:37   #4
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Something I've found is that the older Chart 1's (1984, 8th ed. is what I got) have a much better index of abbreviations than the newer ones. If you come across one cheap, pick it up.
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Old 06-09-2010, 22:40   #5
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I'd venture a guess to say that the 8 ft. high is a buoy...So it's always 8 ft high...unless it's leaning over in a current.

The Marks on the jetty should be height above chart datum ..the M is the visible range to the horizon. To which you would add your height of eye ( off the water ) to the horizon to get the total visible range. So you will see the light at a greater distance due to your height of eye (dipping the light)

I'm guessing that these lights act as sort of a range...to show how the jetty lays out when it's submerged at high tide. The higher light, being the rear end as you approach from seaward?
In this case...it's not a range that you follow in...but one that you leave alongside....... so you line them up..on your approach..obtain a course from the bearing....and then steer that course..as you enter the channel..
but leaving the lights to one side..

I don't know why they're marked with letters..but the Y Z thing makes me think that it's a 2 mark range..... Yankee, Zulu

Or Z for Zuniga ?

but I'm an east coast guy...I'm sure there's a left coaster who will weigh in
with the facts..
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Old 06-09-2010, 22:41   #6
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The Z is harder. It follows the horn so I would expect it to be something about the horn. It might be that the horn blows morse code Z but I would expect the Z to be in parentheses.
If that were so I would expect it to be marked MO(Z). I think it must be a visible marking.
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Old 07-09-2010, 02:08   #7
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On UK Admiralty charts, the height of light is normally the height of the focal plane of the light above the chart height datum, normally Mean High Water Springs.
Here is a link to Chart 5011, our equivilent of US Chart 1
http://www.ukho.gov.uk/Defence/AWNIS/Documents/5011.pdf
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Old 07-09-2010, 13:02   #8
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If that were so I would expect it to be marked MO(Z).
More or less what I said, I just missed the MO.
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Old 07-09-2010, 14:15   #9
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The Z on the chart is in parens, "Z" , so it is the written identifier on the mark. The magenta teardrop indicates that it is a lit mark, not a lit buoy which has a magenta circle.

I can't find it right now, but it won't be a range light (leading light), because I believe they always have iso or occluded or quick flashing as the lights.

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Old 08-09-2010, 07:44   #10
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So, I pulled up the chart 18772. Z and Y are not a range..they are 2 of 5 lights that mark the zuniga jetty. Z, Y, X, W, V

The visibility of all the lights are listed as 6M , though, Z is higher than the other lights. So is it a different intensity lamp?? No color is given for the lights but I looked it up and it's white. Z has a horn that sounds 1 blast every 10 seconds.
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Old 08-09-2010, 10:28   #11
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The visibility for Y-V on my chart lists as 5M with 6M for Z.

Either way I'm feeling good because this was a tricky one! In some of my studying last night I came across "the height of objects is referenced from MHW (mean high water)".
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