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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Navigation Questions. Can you do them?
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Thread: Navigation Questions. Can you do them? Reply to Thread
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Topic Review (Newest First)
03-12-2010 10:00 AM
Boasun "Ocean Passages for the World, pub 136, third Edition. There is a newer edition out now I believe.

This a great planning Publication for Sailing routes. This pub has both Sailing and Steam ship routes in it.
03-12-2010 09:57 AM
Boasun What is the GC distance from Honolulu via the Kaiwa channel to Juan de Fuca Strait?


GC = Great Circle Route.
Note: am using "Ocean Passages for the World, pub 136
03-09-2010 02:39 PM
Boasun Ooopsie! I didn't see that... will check when I get home
03-09-2010 12:15 PM
AdamLein
Quote:
Originally Posted by Boasun View Post
This one hasn't been worked yet that I know of...
So
Quote:
L17°45.25'S by λ121°43.06'W
was incorrect?
03-09-2010 10:28 AM
Boasun Or try this one. Your vessel is on a course of 343°T at 14 kts. At 2156 a light bears 320.5°T and at 2217 the light bears 298°T. At what time and at what distance off will your vessel be when abeam of the light?




Hint: This is a 7/10th Rule... You can victor it or just do the math.
03-09-2010 10:23 AM
Boasun This one hasn't been worked yet that I know of...

Quote:
Originally Posted by Boasun View Post
A ship is on course of 062°, speed 15 kts: Its 1400 DR position is L18°08.08S, λ122°16.0W. At 1420 the distance to Light G at L17 °57.0S, λ122°20.0W, is 9.5 N Miles, no accurate bearing can be taken. At 1620, the bearing of the tower at H L17°39.0S, λ121°44.0W, is 351°. Advance the 1420 circle of position and determine the 1620 running fix.


Note: Use a universal chart for this.
03-09-2010 10:12 AM
AdamLein
Quote:
Originally Posted by Boasun View Post
Well at least download the tables and print out the ones you want to use and put them in a binder.
ooh....

Anyway what's the next problem? I think the most important thing for me to learn is to read the given values well and use them, as opposed to making up my own numbers. Methods aren't as useful when you arbitrarily filter input data
03-09-2010 09:08 AM
Boasun
Quote:
Originally Posted by AdamLein View Post
I have gotten bits and pieces of it for the stuff I happened to be interested in reading about at the time, mostly chapters 15 - 20 or so. That stuff doesn't seem to have changed, except that my edition (1977) seems to have more exercises.
Well at least download the tables and print out the ones you want to use and put them in a binder.
03-09-2010 03:11 AM
AdamLein
Quote:
Originally Posted by Boasun View Post
You need vol II or go and get the new Bowditch. Or download it from nga.mil/portal/site/maritime/
Downloading it only costs you time & effort.
I have gotten bits and pieces of it for the stuff I happened to be interested in reading about at the time, mostly chapters 15 - 20 or so. That stuff doesn't seem to have changed, except that my edition (1977) seems to have more exercises.
03-08-2010 01:56 PM
Boasun You need vol II or go and get the new Bowditch. Or download it from nga.mil/portal/site/maritime/
Downloading it only costs you time & effort.
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