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From: Norm of Bandersnatch (no email)
Date: Fri Jun 02 2006 - 17:43:29 EDT
See annotations...
Norm
S/V Bandersnatch
Lying St Augustine FL
> [Original Message]
> From: Arild Jensen <>
> To: <>
> Date: 5/31/2006 11:40:10 PM
> Subject: RE: Danger Time Limit
>
>
>
> > -----Original Message-----
> > So now we have about 13 miles for us to see the ships bridge, at night
the
> > white lights will probably be higher for another mile or so.
> >
> > Thus we have about a half hour for a 26 knot ship to reach us
> > from the time we can see its bridge in the daytime, somewhat more for a
> slower
> > ship or at night.
>
>
> Norm,
> I assume you would want some leeway and time to take evasive action.
>
Norm - Yes, I would. If I were a singlehander, which I am not, I'm sure I
would adjust my timer to whatever I felt safe with, in this case perhaps 20
min.
> Are you so cool and calculating that you are willing to bet that a ship
will
> miss you by 100 yards as opposed to coming close enough to knock you over?
> Except with some extremely accurate bearings and some even fasrter
> calculations to determine CPA, I just think that your idea is cutting it
too
> fine.
Norm - No, 100 yards is too close normally offshore, although it has
happened rarely and I don't want it to happen again. I don't need to do
any calculations to determine collision or no collision, just watch the
bearing.
> ( grin )
> When I play in traffic I sometimes do such stunts by standing on the
dashed
> lines separating multiple lanes of traffic. I am making an assumption that
> the cars and trucks will not choose to change lanes right where I'm
> standing. But then again; sometimes I could be wrong. SPLATT!!!
> Sometimes drivers freak out because they assume I will remain standing on
> the dotted line.
> Then they pull a panic stop at 40 MPH and they skid out of control. Then
I'm
> at risk again because I do not know where they will skid to next.
> Conclusion, I will not play in traffic any more. <VBG>
Norm- Of course in auto traffic visibility is often blocked by the other
vehicles, especially trucks, so it is usually impossible for the car that
might change lanes and hit you to see you before it is too late. It has no
relation to similar operations on the water where vessels are not occulted
by other vessels.
>
> I think most people's comfort level is more like 1/2 a mile CPA as being
> close miss.
> Therefore they need to know this long before the time of the CPS happens.
> If they need to take evasive action it should happen long before the othe
> rship is within one mile of them.
Norm - Yes, me too. But much depends on conditions. In places with lots
of traffic, like NYC harbor the CPAs will be much closer for my comfort,
but necessary due to denser traffic.
>
> As assumption is made that early it has already been determined that a
> closing situation exist rather than a widening gap and thus range is
> happening.
>
Norm - Whenever I first see another vessel at sea I must assume he is
closing or I would have never come upon him. His bearing, or rather
whether or not it is changing, is then the only thing I need to focus on.
> cheers
> Arild
>
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