Would a radar detector work? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Chat  
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 > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #11  
Old 01-13-2011
Omatako's Avatar
Senior Member
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,499
Thanks: 1
Thanked 31 Times in 28 Posts
Rep Power: 12
Omatako will become famous soon enough
Quote:
Originally Posted by chrisncate View Post
Don't radar detectors work line of sight though?
Yes I'm sure they do - sorry don't know what else to do with the question.

Perhaps you mean "It doesn't tell you where the radar signal is coming from". Well, it doesn't matter where it is coming from, the purpose of a detector isn't to locate the radar source, just to warn you that there is one. Locating the source is down to your eyesight or your own radar.

I apologise if I've missed the point.
__________________

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

__________________

"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."

Arthur C. Clarke
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 01-13-2011
BluemanSailor's Avatar
Member
 
Join Date: Apr 2009
Location: Jenkintown
Posts: 84
Thanks: 17
Thanked 6 Times in 4 Posts
Rep Power: 6
BluemanSailor is on a distinguished road
Actually the CARD does tell you the approximate direction the signal is coming from ( N,S,E or West) and has a signal strength bar.
From their website -"If the C.A.R.D. antenna is mounted on your stern rail and has an unobstructed view, you should receive an indication if there are any radar emitting ships. The overall range is 5 - 8 NM for most merchant traffic."
Used it for one atlantic crossing , but as I previously said it won't work with your own radar system on, and I also found that either NOT all ships have their radars on or the CARD missed some.
Next trip I purchased a Furuno radar, previously had another small radar, and used the watchman mode extensively- worked much better for me especially since I was singlehanding.
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 01-13-2011
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
It would depend on the height of the radar emitter and the height the CARD unit is mounted at. The higher they are, the greater the range.

Quote:
Originally Posted by chrisncate View Post
Lol, I am such a horrible communicator... sorry about that! It's even worse in real life. I am socially retarded basically.

I meant to question wether or not radar goes over the horizon, and if it does not, isn't the horizon closer than 24 miles? Would the radar detector go off if the source of the radar was over the horizon?
__________________
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.
Reply With Quote Quick reply to this message Share with Facebook
  #14  
Old 01-13-2011
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 16,083
Thanks: 99
Thanked 281 Times in 271 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Formula (approx distance) d = 1.2246* SQRT(h); d in miles with h in feet.

Using this, you get 3.87 miles distant at a 10 foot height; 5.47 miles at 20 feet. 50 feet up gets you out to 8.659 miles. This is, ostensibly, distance to the horizon so taller objects 'over' the horizon could still be visible. Light refraction also affects the truly visible range... might not affect radar.

This method does not account for the curvature of the earth. Consider how "far" you could(n't) see sitting in a life raft.....
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)

Last edited by Faster; 01-13-2011 at 07:22 PM.
Reply With Quote Quick reply to this message Share with Facebook
  #15  
Old 01-13-2011
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 9,017
Thanks: 27
Thanked 56 Times in 53 Posts
Rep Power: 7
jackdale will become famous soon enough
For the mathematical challenged there is a nomogram for estimating distance on page xii.

http://www.notmar.gc.ca/eng/services...fronte2007.pdf
__________________
__________________
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 Quick reply to this message Share with Facebook
  #16  
Old 01-14-2011
HDChopper's Avatar
Needing Apehanger Helm
 
Join Date: Oct 2010
Location: AZ
Posts: 495
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 5
HDChopper is on a distinguished road
Well you just got all the good links Jackdale.

Thanks !
__________________
There is no right way to do the wrong thing
Reply With Quote Quick reply to this message Share with Facebook
  #17  
Old 06-27-2013
43 retired, own two boats
 
Join Date: Aug 2011
Location: Poquoson, VA
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Turandot is on a distinguished road
Send a message via MSN to Turandot
Re: Would a radar detector work?

AIS detector is the gadget you are looking for, some newer vhf radios come with them already built into the radio transmitter.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

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:

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

 
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
Radar Reflectors: How well does yours work? Boasun General Discussion (sailing related) 10 10-25-2010 11:05 PM
choosing a carbon monoxide detector rmeador Gear & Maintenance 2 09-22-2010 12:49 PM
Real world experiences using radar -- how far can your radar really "see"? MARPA? Bene505 General Discussion (sailing related) 62 12-08-2008 08:39 PM
Radar Detector wind_magic Gear & Maintenance 4 07-02-2007 07:15 AM
Carbon Monoxide Detector quinlanmw Gear & Maintenance 2 12-28-2003 06:34 AM


All times are GMT -4. The time now is 05:33 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, 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.