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Old 20 December 2007, 17:38   #31
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I've no idea whether the devices you are advocating are able to discern colour,
JW - no they don't they are measuring the heat emitted by the object(a function of its temperature and the material at the surface). Whilst more modern systems will display this in colour - it is not the colour of the object just a representation of the temperature/emissivity (in the same way that a colour fish finder isn't actually measuring the colour of the bottom).
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Old 20 December 2007, 17:42   #32
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Thanks for that, it's what I guessed but couldn't say.
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Old 20 December 2007, 17:48   #33
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I intend to mount it on the A frame but since I am going to have a custom frame made up it will be relatively high and I will have a pedestal mount above that to mount the radome on.
Since we will be sitting about 5-6 feet in front and about two feet below the horizontal plane we should be fine. We will still catch the fringes of the beam but only just. Or I may put it over the console, haven't made my mind!
I don't know the type of ribbing that you get upto, but I doubt whether you'll actually need to have it switched on that often. I'm an advocate of having radar on ribs, but switch it on when you really need it rather than just to have another cool screen to look at. Around here at night, inshore, crab pots are much more of a hazard than anything that the radar is going to pick up. I'd rather keep my eyes peeled for pot dans than upset my natural night vision by looking at bright screens.
If you're in thick fog or offshore in shipping areas at night, then that's a different matter.
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Old 20 December 2007, 18:16   #34
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Mollers, as you say, the lighting is a problem at night and that goes for plotters, radio etc too but I limit it with a smoked perspex overlay which works well. The three radars I've had have a minimum range of 1/8 mile which is just a couple of hundred metres and at that range they were able to pick up danbuoys...you need to know they are in the vicinity though or you'd not be on that range anyway so I guess limited use. It's the fekkin plastic milk bottles around here.

Something which is common on ribs is the radome mounting at an incorrect angle. Most radars have about 20 vertical angle of transmission. Since there's very little in the sky at close range which you would want to see, it's worth having the radome angled down to ensure it sees the sea at 200 meters.
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Old 21 December 2007, 10:24   #35
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Since we will be sitting about 5-6 feet in front and about two feet below the horizontal plane we should be fine. We will still catch the fringes of the beam but only just. Or I may put it over the console, haven't made my mind!
Don't forget that the helm will probably be standing a lot of the time.
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Old 21 December 2007, 11:44   #36
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I very rarely stand, really only in really rough weather. in fact the whole point of the large dual console is to give both of us a comfy seat out of the wind.
I don't intend to have it switched on much either, bit pointless when in good weather you can see more than the radar can possibly pick up!
I sometimes have been out in the Forth, Clyde and offshore Argyll where it has been known to be foggy, high rainfall or ships charging up and down or even all three at once. This is when I think it will be useful.
I can think mof a several occasions being able to know what was around would have made me feel a whole lot better!
The fact that I called it a gadget seems to upset some folk but what are RIBs to most users but expensive toys?
Anyway its on order along with a Icom M505, Garmin 340 colour sounder and Sony marine CD/MP3 player to go along with the garmin 182C plotter and charts I aready have.
That should be enough "gadgets" to keep me amused for a while!
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Old 21 December 2007, 11:44   #37
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Codders, radar gives you much more information than seeing. You can view the positions of vessels relative to your own boat and relative to each other. You can see their distances from yourself and others and you can see their direction of travel with certainty. You can predict the likely movement of traffic based on its current movement and so plot you own course more effectively. Seeing comes a poor second. I've said it before but I'm going to repeat it; I've frequently seen vessels, during daylight, on the radar before I've noticed them visually.
If you're in an area when you are viewing discontinuous land, either islands or promontories, because of your low viewing angle it is impossible to discern with certainty the layout and the distances off, radar shows this clearly.
At night it can be very difficult, and sometimes impossible, to see navigation lights and the other displayed lights on vessels either because of the background illumination or simply because of your distance from them. Radar allows you to see them and make an educated guess at their likely movements. For example, if you notice a vessel following a curved path it is possible it's fishing and you may wish to give it searoom in a particular direction. Even if it isn't fishing, you're alerted to it being unpredictable and you'll be giving it that extra room.
I've no idea whether the devices you are advocating are able to discern colour, if not then you're not going to have much more information about vessels other than simply knowing they are there and that's only if you have spotted them in the first instance. If you're out at night and it's only slightly busy I'd doubt you could keep track of and make proper sense of what's happening around you by simply seeing in IR.

The notion that radar is only really of use in fog is wrong.

If you have radar and learn how to use it well, as I said to BruceB, it'll become your friend.


I have used radar many times - I have only used FLIR once - but I was totally won over by it. It really is incredible but then again the system I was looking at cost about 50,000!!!
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Old 22 December 2007, 04:25   #38
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I have used radar many times - I have only used FLIR once - but I was totally won over by it. It really is incredible but then again the system I was looking at cost about 50,000!!!
So your recommendation wasn't based on any personal knowledge of the type of unit you were recommending then? And you wonder why people have a go at you?
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Old 22 December 2007, 08:12   #39
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So your recommendation wasn't based on any personal knowledge of the type of unit you were recommending then?
.....
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Old 24 December 2007, 04:02   #40
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So if your going to buy one which one would the panel go for

As there is one day left for my darling wife to get it and wrap it for me
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