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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Radar signature
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Topic Review (Newest First)
02-20-2014 07:30 PM
Frogwatch
Re: Radar signature

The type of reflector with the planes intersecting at right angles (Davis) are best if used in the "catch rain" position but most seem too small to be useful as they are barely bigger than the wavelength being used. A bigger one would be hard to assemble and too heavy but should give much better performance.
So, there is at least one company selling one that is inflatable that seems to be large enough to be useful. Inflate and hoist when needed.
The size issue is why I devised my version made from silver coated ripstop nylon. At 16" diameter, it is considerably bigger than the 12" ones and is actually lighter. It is designed to sort of "pop" open out of its sack and is weighted to always be in optimal orientation. I put all this effort into developing the darn thing making at least 12 versions sewing them on my wife's machine, finally got one I really like and now find that I don't know anybody with a radar to test it.
02-20-2014 12:50 PM
outbound
Re: Radar signature

Last two boats have put on gimbals just above storm jib set up. Found on prior boats with the relatively narrow beam width of enclosed dome radars heel does make a difference. With small boats to windward if beam doesn't hit them you don't see them. Also regardless of that the higher the dome the bigger the circle around your boat where you don't gets hits but the farther out you can see. I'm mostly worried about ships and use the thing to help navigate so want to see shore contours. Like it reasonably high up. Also like to see weather before it comes to me. Others may want it lower if concern is nearby 18' center consoles which have a poor return.
02-20-2014 12:09 PM
SailingJackson
Re: Radar signature

Quote:
Originally Posted by Lake Superior Sailor View Post
Maybe you should concider your installation.. Mine is mounted at the spreaders and it picks up everything..My girlfreinds son is a Marine Helicopter Electronics engineer, and he was impressed! after he got done playing with it: I had to have him put it back, to my setting so I could use it! ..Dale
Mine is slightly above the spreaders, as seen here: MarineTraffic

I pick up everything in flat water, but small things are confused with waves in any significant sea state.
02-20-2014 11:57 AM
Lake Superior Sailor
Re: Radar signature

Maybe you should concider your installation.. Mine is mounted at the spreaders and it picks up everything..My girlfreinds son is a Marine Helicopter Electronics engineer, and he was impressed! after he got done playing with it: I had to have him put it back, to my setting so I could use it! ..Dale
02-20-2014 10:49 AM
SailingJackson
Re: Radar signature

Quote:
Originally Posted by Lake Superior Sailor View Post
My boat has raymarine RL70RC and I have only noticed It not picking up Inflatables and Plastic swimming islands. Sailboats and powerboats and ships are picked up great. I find if your not watching or fail to turn it on it's not much good. This is old radar , lots of newer and better stuff out there. I would worry about Inattentive captains, as it takes two in most cases......Dale
I've got Raymarine 4kw and find it not very reliable. In good conditions I can see little stuff, but in any sort of sea the waves clutter hides boats pretty well.

It's indicated as a 40 mile radar, but on a good day I can pick up the broadside of a freighter at 50 miles and, just offshore Wisconsin, I can pick up cliffs on the Michigan shore around 60 miles out. Never the less, it does not see 18' boats in 3-4' waves no matter how it's tuned.

GTJ
02-20-2014 12:42 AM
Lake Superior Sailor
Re: Radar signature

My boat has raymarine RL70RC and I have only noticed It not picking up Inflatables and Plastic swimming islands. Sailboats and powerboats and ships are picked up great. I find if your not watching or fail to turn it on it's not much good. This is old radar , lots of newer and better stuff out there. I would worry about Inattentive captains, as it takes two in most cases......Dale
02-19-2014 07:38 PM
hellosailor
Re: Radar signature

Minne-
I don't know how or if they tested it, just that there were no objective tests comparing the idea to other options. And, despite their years of experience and wisdom, personally I wouldn't want a wood mast on any boat I owned or sailed, in any case. Unless it came with a full crew and maintenance staff to deal with the brightwork and rot for me.
02-19-2014 07:28 PM
Argyle38
Re: Radar signature

Quote:
Originally Posted by knuterikt View Post
Here is a test from 2005 - don't think much have happened since then
http://www.yachtingmonthly.com/fileB...ce_ym_june.pdf
One more
http://www.maib.gov.uk/cms_resources...s%20report.pdf
This is exactly the article that I was thinking of. Thank you! I though I had read it in one of my print mags, but someone must have linked to it. There was a similar discussion on CF a few months ago, someone must have linked it there.

Oh, yeah, and Yachting Monthly is fantastic. I picked up a copy when I was in England a few years ago. I wish there was a US publication like that.
02-19-2014 07:00 PM
Minnewaska
Re: Radar signature

Funny. I have a buddy with AIS and he asks me to check all the time. He's never transmitting!

I wish he was, as everytime I ask where he is, he gives me some erroneous coordinates. Usually reading the location of the cursor, rather than his vessel, or something like it. Cracks me up. He once told me he was essentially 5 miles inland.
02-19-2014 06:23 PM
outbound
Re: Radar signature

Minnie- great point. That's why every once in a while go out with a buddy and check how he/I show up on AIS/Radar and we chat on each radio on the two boats. When one of is off cruising also pick a time to chat on SSB. He has Ham at his house. Also wonder how many folks have AIS but don't know they are not sending.
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