Backwards (mis)use of a GPS - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 25 Old 09-04-2008
Special Delivery
 
speciald's Avatar
 
Join Date: Mar 2007
Location: live on boat
Posts: 661
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
Send a message via Skype™ to speciald
A frequent problem in coastal travel is that two boats on reciprocal courses will set the sea buoys as their waypoints. About half way there, they run directly into each other. Set your waypoints a few hundred yards from the entrance buoys.
speciald is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 25 Old 09-04-2008
Senior Member
 
Join Date: Jun 2007
Posts: 2,708
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
   
Got a good friend who has a remote joystick controlled spotlight mounted up on the bow pulpit of his 30' power boat. That seems to work pretty well.

I tend to set my waypoints to be near or between buoys, not on top of them. Only exception so far has been the spar buoys for the club's race course--those I set dead on.

Jim

Last edited by SEMIJim; 09-04-2008 at 08:44 AM.
SEMIJim is offline  
Quote Quick Reply Share with Facebook
post #13 of 25 Old 09-04-2008
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Quote:
Originally Posted by halekai36 View Post
Having tried them many times I can assure you they will destroy your night vision! I still have one on board for emergencies but not for general steaming. If you do use one you really need to get it out over the bow pulpit to avoid any deck reflections. Even then the glare off the water will still kill your night eyes.

I made a stowable "light bar" that I can zip tie to my bow pulpit and plug into my anchor locker. It has four amber colored fog lights mounted to it and it picks up lobster pots very easily. An item like this, or a 1,000,000,000,000,00 gazillion power spot light, should only be used in absolute necessity as it does not meet COLREGS.

Again, 1,000,000 candle power anything will ruin your night vision, which you need!

Just raced last night and sailed back to Portland Harbor in the pitch black. One crew guy brought a LED head lamp with no red lens! Every time he fired that damn thing up I lost lobster pots for a good 60-90 seconds before my eyes recovered. We have banned his headlamp from above deck use for the remainder of the fall series unless he gets a red lens for it...
The amber lights are a good compromise. I'm surprised you didn't pitch the guy overboard.

Sailingdog

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

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #14 of 25 Old 09-04-2008
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,789
Thanks: 18
Thanked 204 Times in 154 Posts
Rep Power: 16
       
Quote:
Originally Posted by sailingdog View Post
The amber lights are a good compromise. I'm surprised you didn't pitch the guy overboard.
We were already short two-three guys and running with only three. I still think we won our class but corrected time will tell. It was a short course and being almost 3/4 of a mile ahead at the finish I think should do it..

When he finally left it off for a few minutes he realized he could actually see what he was doing with out it but he had become night blind and was needing it every 30 seconds or so.

P.S. A Raymarine C-70 does not dim worth a darn & I wound up turning it off.. Funny how Datamarine & Ritchie could/can make stuff that does not destroy night vision but a Raymarine plotter can't? I had it on night mode and then dimmed all the way down and still it was too bright. The owner of the boat agreed that it needs a few more click on the "less back-light" side..

______
-Maine Sail / CS-36T


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




© Images In Posts Property of Compass Marine Inc.



Last edited by Maine Sail; 09-04-2008 at 08:58 AM.
Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #15 of 25 Old 09-04-2008
Anything-Sailing Founder
 
ckgreenman's Avatar
 
Join Date: Aug 2008
Posts: 2,239
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
 
Send a message via AIM to ckgreenman Send a message via MSN to ckgreenman Send a message via Yahoo to ckgreenman
Quote:
Originally Posted by davidpm View Post
I just thought that setting a way point and missing it on purpose was a creative use for a GPS.
Not taking about normal navigation.
I use my GPS that way all the time. The lake we're on has a lot of shoals and other submerged towns..err hazards. I plug those in as land marks so I know where they are and can avoid them (or others can if their at the helm). Some of those were found the hard way. lol
ckgreenman is offline  
Quote Quick Reply Share with Facebook
post #16 of 25 Old 09-04-2008 Thread Starter
Senior Member
 
davidpm's Avatar
 
Join Date: Oct 2007
Location: Madison
Posts: 3,893
Thanks: 218
Thanked 58 Times in 50 Posts
Rep Power: 8
 
Quote:
Originally Posted by halekai36 View Post
Just raced last night and sailed back to Portland Harbor in the pitch black. One crew guy brought a LED head lamp with no red lens! Every time he fired that damn thing up I lost lobster pots for a good 60-90 seconds before my eyes recovered. We have banned his headlamp from above deck use for the remainder of the fall series unless he gets a red lens for it...
I just saw a "Myth Busters" and they claim that night vision is damaged for up to half an hour.

This website says you get back only 10% in 10 minutes and 30 to 45 min to get back 80%
Night Vision - The Red Myth
davidpm is online now  
Quote Quick Reply Share with Facebook
post #17 of 25 Old 09-04-2008
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,789
Thanks: 18
Thanked 204 Times in 154 Posts
Rep Power: 16
       
Quote:
Originally Posted by davidpm View Post
I just saw a "Myth Busters" and they claim that night vision is damaged for up to half an hour.

This website says you get back only 10% in 10 minutes and 30 to 45 min to get back 80%
Night Vision - The Red Myth
Very interesting reading. For last night all I cared about was enough night vision recovery to see lobster pots and I had it in about a minute to a minute and a half. On an all night sail with no lights and no city lights in the distance and minimal moon my eyes take a long time to reach their best I never knew it could take that long though.

I think I'll still stick with red because it seems to have worked for me for over 25 years now. Perhaps blue green would be good too but it's tough finding blue/green lenses. Prior to red lenses we use oil lamps on a low setting and never looked directly at them....

______
-Maine Sail / CS-36T


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




© Images In Posts Property of Compass Marine Inc.


Maine Sail is offline  
Quote Quick Reply Share with Facebook
post #18 of 25 Old 09-04-2008
Thanks Courtney.
 
Join Date: Sep 2006
Location: IL
Posts: 3,954
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 11
     
Quote:
Originally Posted by halekai36 View Post
A Raymarine C-70 does not dim worth a darn & I wound up turning it off.. Funny how Datamarine & Ritchie could/can make stuff that does not destroy night vision but a Raymarine plotter can't? I had it on night mode and then dimmed all the way down and still it was too bright. The owner of the boat agreed that it needs a few more click on the "less back-light" side..
I have the same problem with my Lowrance. Still looking for a fix.

hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl
T34C is offline  
Quote Quick Reply Share with Facebook
post #19 of 25 Old 09-04-2008
Senior Member
 
artbyjody's Avatar
 
Join Date: Jan 2008
Location: Bellingham, PNW
Posts: 3,146
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 11
       
Might want to try using a 1/4 inch red plexiglass over the display. If I recall correctly, while underway - that is what we did for instruments that did not have red backlighting.

Cut holes out at the top and bottom that you can use a small bungee cord to wrap around the display and make the plexiglass only as big as the screen...or go all out and use the faceplate as a template and cut out holes for all the buttons etc...to lay on top of the existing faceplate

In the Navy the only time we used red was under "Battle Stations" - I don't think it had much to do with night vision per se, as normal underway we used green lights (which are actually easier on the eyes and cause less strain.)...

-- Jody

S/V "
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
" -
1983, Barberis Show 38! or
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



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







artbyjody is offline  
Quote Quick Reply Share with Facebook
post #20 of 25 Old 09-04-2008
Senior Member
 
Join Date: Jun 2007
Posts: 2,708
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
   
Interesting. Our new Ritchie SR-2 compass



has a green LED. Wondering what that'll look like at night with a blue card with white lettering? (Won't find out for a while, as it's mast-mounted and there's no power for it up there, yet.)

Jim
SEMIJim is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Handheld GPS Overview Tom Wood Seamanship Articles 0 05-31-2001 08:00 PM
GPS Gets More Accuracy Jim Sexton Seamanship Articles 0 05-21-2000 08:00 PM
GPS Gets More Accuracy Jim Sexton Gear and Maintenance Articles 0 05-21-2000 08:00 PM
GPS Gets More Accuracy Jim Sexton Cruising Articles 0 05-21-2000 08:00 PM
Advanced GPS Interfacing Jim Sexton Gear and Maintenance Articles 0 10-07-1999 08:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome