Navigation Questions. Can you do them? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation
 Not a Member? 

Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


Reply
 
LinkBack Thread Tools
  #11  
Old 02-27-2010
AdamLein's Avatar
Senior Member
 
Join Date: Nov 2007
Location: Coquitlam, BC
Posts: 1,866
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 7
AdamLein will become famous soon enough
Ditto... 3 degrees @ 60 nm/degree = 180 nm, + 13' @ 1 nm/' = 193 nm.
__________________
s/v Essorant
1972 Catalina 27
Reply With Quote Share with Facebook
  #12  
Old 02-27-2010
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,064
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
The true heading is 010° but the magnetic heading from the compass rose on the chart reads 012°; What is the variation?
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture
Reply With Quote Share with Facebook
  #13  
Old 02-27-2010
Boasun's Avatar
Senior Member
 
Join Date: Feb 2007
Location: New Orleans, LA
Posts: 3,064
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 9
Boasun will become famous soon enough Boasun will become famous soon enough
One other:
the scale of a chart is 1:80,000. What distance at sea does a distance of 3.5 inches on the chart represent? What distance on the chart represents an actual distance of 14.3 NM?






Remember that a NM is 6076.11549 ft thought we use 6000 ft for practical purposes.
__________________
1600 Ton Master, 2nd Mate Unlimited Tonnage

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maritime Instructor
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

S/V Rapture

Last edited by Boasun; 02-27-2010 at 12:47 PM.
Reply With Quote Share with Facebook
  #14  
Old 02-27-2010
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,833
Thanks: 26
Thanked 36 Times in 33 Posts
Rep Power: 6
jackdale will become famous soon enough
Quote:
Originally Posted by Boasun View Post
The true heading is 010° but the magnetic heading from the compass rose on the chart reads 012°; What is the variation?
2° West
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #15  
Old 02-27-2010
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,833
Thanks: 26
Thanked 36 Times in 33 Posts
Rep Power: 6
jackdale will become famous soon enough
You do not need the chart.

This an example that I use to teach set and drift, CMG, SMG, CTS, Speed.

Quote:
On November 18, 2003 we plan on leaving Thieves Bay Marina, Mouat Point Light (Lat 48°46.5’N Long 123°18.75’W) for Isabella Island (Lat 48°43.75’N Long 123°25.75’W). We will use the current information for Swanson Channel. The chart shows the flood direction to be 360. Using our current prediction tables, we determine that that the drift is 1 knot. Our boat speed is 5 knots. Our course to make good is 242T. We need to gauge our speed made good and our course to steer.
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #16  
Old 02-27-2010
Junior Member
 
Join Date: May 2008
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
TheBishop is on a distinguished road
Answer to set/drift prob.

CTS = 252 T
VMG = 5.4 kt
Reply With Quote Share with Facebook
  #17  
Old 02-27-2010
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,833
Thanks: 26
Thanked 36 Times in 33 Posts
Rep Power: 6
jackdale will become famous soon enough
Quote:
Originally Posted by TheBishop View Post
CTS = 252 T
VMG = 5.4 kt

Not quite

The solution is here:

http://www3.telus.net/jackdale/navlessons/detercts.pps Works best in IE.

For Firefox - Determining Course to Steer

Jack
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #18  
Old 02-27-2010
Junior Member
 
Join Date: May 2008
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
TheBishop is on a distinguished road
Riddle me this

If the wind is reported as 360T, it's coming from the North. If the current (set) is reported as 360T, it's going to the North. Who decided this, and was it done just to torture me?
Reply With Quote Share with Facebook
  #19  
Old 02-27-2010
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,833
Thanks: 26
Thanked 36 Times in 33 Posts
Rep Power: 6
jackdale will become famous soon enough
The set is 360. You are being pushed north. The wind is not a factor.
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Share with Facebook
  #20  
Old 02-27-2010
Junior Member
 
Join Date: May 2008
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
TheBishop is on a distinguished road
Sorry -- I wasn't saying the wind was a factor. I was just asking why, when set is reported, it's the direction I'm being pushed. But when wind direction is being reported, it's the other way around. So if the wind is 360T, it's *from* the north, but when current is 360T, it's *to* the north.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Working With the Stars—Celestial Navigation Jim Sexton Seamanship Articles 0 05-06-2003 08:00 PM
Working With the Stars—Celestial Navigation Jim Sexton Her Sailnet Articles 0 05-06-2003 08:00 PM
Navigation Basics Jim Sexton Learning to Sail Articles 0 01-04-2002 07:00 PM
Navigation Basics Jim Sexton Seamanship Articles 0 01-04-2002 07:00 PM
Navigation Basics Jim Sexton Her Sailnet Articles 0 01-04-2002 07:00 PM


All times are GMT -4. The time now is 12:23 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.