Random trivia...can we make this work

[Boasun]

The 1st brg is 22.5 degrees off the bow
The 2nd brig is 45 degrees off the bow.
Thus you have the 7/10 rule with those two brgs.
The time difference between the 1st & & 2nd brg is 29 minutes.
S x T / 60 = D or DR to the 2nd brg in this case.
11 x 29' / 60 = 5.3nm
7/10 Rule has the DR X 0.7 = dist to CPA from 2nd brg.
5.3 x 0.7 = 3.7nm
D / S + Time = ETA
3.7 / 11 + 0048 = 0108
or
3.7 / 11 x 60 = 20'
0048 + 20' = 0108

The answer is CPA of 3.7nm @ ETA of 0108

For some people it is easier to do on a Manuevering board...

[flyingwelshman]

Originally Posted by Boasun

The 1st brg is 22.5 degrees off the bow
The 2nd brig is 45 degrees off the bow.
Thus you have the 7/10 rule with those two brgs.
The time difference between the 1st & & 2nd brg is 29 minutes.
S x T / 60 = D or DR to the 2nd brg in this case.
11 x 29' / 60 = 5.3nm
7/10 Rule has the DR X 0.7 = dist to CPA from 2nd brg.
5.3 x 0.7 = 3.7nm
D / S + Time = ETA
3.7 / 11 + 0048 = 0108
or
3.7 / 11 x 60 = 20'
0048 + 20' = 0108

The answer is CPA of 3.7nm @ ETA of 0108

For some people it is easier to do on a Manuevering board...

Boasun, I am not trying to argue with you - I respect your knowledge and experience. I am new to this and want to learn.
I am confused. I was taught that if the angle of the second bearing is twice the angle of the first bearing, then the CPA is equal to the distance traveled between sightings.
In your example the first bearing is 022.5 and the second is twice that at 045.
We agree on the distance traveled (5.3ish nm), so I don't understand why this rule wouldn't apply.
I don't recall hearing about the '7/10' rule. Would you mind clarifying that for me?
If this has de-railed the trivia thread, I apologize. Perhaps, if you don't mind, Boasun you and I can take this over to PM?
Thanks

[Boasun]

You have several rules for various sets of brgs.
7/10 rule is for the 22.5/45 brgs
7/8th rule for 30/60
1.4 rule is for 26.5/45
Plus about 6 other rules in brg sets, including the Natual Cotangent rule.

You can find these rules in either Bowditch or Dutton's or Formulae for the Mariner. There may be other books on navigation that will have them. But the ones I've named are my references for class.

But the easiest way is to use the manuevering board and you needn't worry about which rule to use for distance off. Plotting on a chart works but the MB is the way to go for ease.

[Boasun]

Seeing that everyone is totally confused, lets go with something easier:
Where would you find CARLINGS on your boat??

[nolatom]

Originally Posted by Boasun

Seeing that everyone is totally confused, lets go with something easier:
Where would you find CARLINGS on your boat??

along the centerline, fore and aft, to support the deck?

[deberg351]

I am loving this entire thread. I read through the first 30 pages or so, and was content to be in the ballpark with around half the answers. I'll hop in eventually if I'm in the right time and the the right place (and I know the answer).

[Boasun]

Sorry NOLATOM, you are warm but not close enough to be even considered in the ball park.

[poopdeckpappy]

As we know a caboose is the last car on a train but, where else was it found and what was it used for

[dacap06]

Originally Posted by poopdeckpappy

As we know a caboose is the last car on a train but, where else was it found and what was it used for

Hmmm ... I have a fuzzy recollection of a conversation I had as a Midshipman with a mustang LCDR who prided himself on his knowledge of nautical terms and history. He mentioned that a while back a caboose used to refer to the cast iron cooking ranges in the galley, or even to the galley itself. Anyway, how close is that definition to what you had in mind?

[poopdeckpappy]

very close,

Answer: a iron pot on the deck of old whaling ships to boil whale blubber