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Old 12 August 2007, 15:24   #11
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Adverts for these Radars are difficult to follow. I can't work out if you get everything for this price or if the antenna is more money. I also can't work out how the antenna fits and what size it is etc.
I think you get all you need. The advert says the raydome is 15" diameter. Normally the mounting is bolts which go up through a plate and screw into the base of the raydome. However, I'd be waiting and saving up for a 4kw raydome and a colour display. The difference is well worth paying for.
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Old 12 August 2007, 15:33   #12
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So is there a RADAR transmitter that you can stick in front of you on the RIB that doesn't emit to the rear.
I'm still on the steep part of the learning curve when it comes to radar, but on 'bigger' (commercial / military) radar you can get a function called 'sector blanking' which (AFAIK) cuts the transmission within a user defined area - I don't know which if any smaller radar units support this.

However, bear two things in mind - firstly radar needs to be as high as possible to get a reasonable range and secondly whilst you may be moving fast (and in conditions when you are having to rely on radar I would be inclined to throttle back), there may be other traffic coming up behind you faster.

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Old 12 August 2007, 15:38   #13
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...but on 'bigger' (commercial / military) radar you can get a function called 'sector blanking' which (AFAIK) cuts the transmission within a user defined area - I don't know which if any smaller radar units support this.
Biggles' advert for the Furuno say is has this facility. Does is actually blank the transmission or does it blank a sector from the screen?
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Old 12 August 2007, 15:54   #14
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I was thinking more of FLIR goggles or helmet cam. As to range you don't get much of a range on a RIB anyway as you are so low down.

FLIR will see through fog to a certain extent and is awesome at night of course. I think it would get used FAR more than RADAR!!!
Assuming an antenna height of 2m above sea level and flat conditions, you should be able to pick up a 1m high target at about 5 nM, a 10m high target at about 10 nM and the Needles (141m) at close to 30 nM. Obviously if wave height is significant this will be reduced, or at least intermittent.

In my experience with boat mounted thermal imaging kit (admittedly I haven't trialled the latest generation of kit), performance is very limited in fog, even heavy rain has a marked effect. In thick fog when you really need it, performance is not that good at all. Maximum range I would say is maybe 1 nM.

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Old 12 August 2007, 15:58   #15
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Obviously it won't replace RADAR in all conditions - a lot depends on how you use your boat. if you get frequent fogs then RADAR is a godsend - if you operate a lot at night with not much fog FLIR would be far more useful......
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Old 12 August 2007, 16:01   #16
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Biggles' advert for the Furuno say is has this facility. Does is actually blank the transmission or does it blank a sector from the screen?
My understanding is that it blanks the transmission, however I wouldn't take my word for it . Probably best to check with the manufacturer / dealer. I can't think why you would want to blank a sector of the display if it didn't blank the transmission, but like I said I'm still on the steep part of the learning curve.

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Old 12 August 2007, 18:04   #17
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Blanking sectors is very useful on a boat as RADAR does interfere with some navigation sensors and receivers, the other advantage that has already been pointed out is that it offers protection from RF radiation. I used to work at a land based test facility and all these RADAR systems had this facitlity, these ranged from Naval systems to commercial ones and that was 15 years ago.
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Old 12 August 2007, 19:23   #18
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There ya go then Biggles, buy the Furuno and set the blanking for where your head is.

Just a thought since you felt that radar seeing behind isn't too much use; mostly that's probably correct but if the sea roughs up and you have to travel slowly, since you'll be preoccupied handling the boat it's good to keep an eye out behind. Some of the commercial vessels are travelling around the 20-25 knot mark and they could creep up on you.
Plus, you might need to look out for the polis.
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