PBO Puzzle No. 40

[MUS]

Correct me if I'm wrong but isn't a white group flashing (2) an isolated danger mark?

The PBO Solution on page 19 seems to think it's a safe water mark!

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[Peppermint]

Fl(2) or GpFl(2) white = isolated danger

Lfl10s White = Safe Water Mark could be iso too

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[tome]

Ooops!

See what you mean - they'll have a bit of egg on their faces then.

Well spotted

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[sarahnorbury]

Mus, thanks for pointing this out to the entire internet! Many similarly sharp-eyed readers have written and emailed to advise us of the same. Unfortunately, despite our fanatical fact-checking, occasionally a mistake occurs. This one happened when the wrong answer was cut and pasted from our computer file of the four possibles. (Bit of a mystery this, as the correct answer was in red, a system which has worked perfectly for the other 39 puzzle answers.) The page was checked late in the day, at the end of a hectic month, and somehow this got missed.
Just in case you thought, as one correspondent did, that we might have given to prize to someone who got the wrong answer, we didn't, we were well aware of the mistake the minute we got our office copy and a member of staff uttered Oh ****!
Apologies to all; there will be a full correction in the June issue,
Sarah Norbury, PBO Editor


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[peterb]

Safe water marks have four possible patterns:

Long flash every 10s

Occulting

Isophase

Morse A i.e. dot dash

The only pattern to have a defined period is the first. Thus, in the Thames Estuary, Pye End, Orford Haven and Wallet Spitway are all LFl(10s); Swin Spitway and HA are both Iso, but the first is 10s and the second is 5s; Woodbridge Haven and (Harwich) Haven are both Mo(A) but the first is 15s while the second is 5s. Occulting Safe Water marks seem fairly rare; is it because of the higher power requirements?



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[madman]

Why do you need something to tell you if the waters safe? Surely it must be an awful big job to keep changing the bouys just because there's a few jellyfish or sharks about?

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