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Old 20 March 2004, 15:18   #11
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Overlaying....

Brian,

Well, like I said, I have only seen it over the shoulder of someone else at the helm and never used it myself.
But it looked extremely useful...not to be used all the time but as an option perhaps.
A search for overlay in this forum gave this

Crazyhorse (how is his cabin rib coming along btw?) seems to have opted for this feature
a bit more than a year ago..

The theoretical advantages are I guess obvious..
it should give you a very fast overview of what is going on with other boats around you, without having to refer positions between the chartplotter
and radar displays and the closest you can get to having the other boats moving about as numerical dots in your chartplotter, until those digital ID transponders for ships become
a reality for recreational vessels next month...;-)

..but seriously..it should be a great feature if properly implemented as a nice read-out.
I mean GPS chartplotting is already such an incredible luxury for anyone who has spent more than a few years at sea from time to time and remembers the old days annoGPS.
Now add basic radar functionality scaled and mapped into the same display
I mean...who would have thought that would be possible in a recreational vessel..
These are the good times.
Safer, further and more fun too..

best
Janne A.
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Old 20 March 2004, 18:58   #12
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Well, I have no special comment regarding the NavNet overlay, it worked like all dealers and brochures say. Very clear on 10,4" screen, you have also a lot of different color options for screen, so I am sure you get clear vision for targets easily. Note that you need an electronic compass also, I'd suggest Furuno PG-500 that is a great one even for a small commercial boat or workboat.

I drove nearly 1100 NM during 8 days with 10,4" Furuno, on sunny days we used chart only, but in dark (300-400 NM) we used also radar on divided screen or overlay mode. It's a choice of yours, which mode you want to use, of course overlay will validate your chart nicely, for example in some ranges C-Map chart did not show ceratin markings and your radar could see them. On the other hand, in clear sea you might use divided screen and just follow on chart that you are on the right track and check shortly on radar that no-one is nearing you....difficult to say, which one is clearly the best scenario. Anyway, just buy the compass to your system, it's worth investment, a cheap price for overlay function.

Mechanical quality in old Raymarine systems like RC80 etc. were better, but current C-series was a disappointment for me. Cheap prices, mechanical quality low. Furuno unit went through nearly hell on our boat, I really don't think many Furunos sold has gotten that rough handling, but there were no problem with gear through the trip.
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Old 21 March 2004, 06:16   #13
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I am going for the Simrad CA44, combined with radar, plotter and sonar.
They use a LCD screen wich is very nice because it`s not very deep.
If you look at the similiar Furuno the screen is very deep and takes a lot of space, what is pretty cool on Furuno is that you can install a camera for not very much money, for example have the camera set up in the back and than you will se on the screen if it`s coming up any boats from behind.
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Old 21 March 2004, 07:15   #14
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I would be rather worried about radar on a RIB - that magnetron would be too close to my head for comfort - also what sort of range do you get so close to the water?
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Old 21 March 2004, 07:22   #15
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Quote:
I would be rather worried about radar on a RIB - that magnetron would be too close to my head for comfort - also what sort of range do you get so close to the water?
Depends on how high you put the radar.
actually a radar is not much stronger than a cell phone, people thinks that but it`s not.
Why i need a radar is because we are navigating in 30,000 islands and very often during the night in speed around 30-50knots, sometimes it`s not more than 40m between islands.
You have 15m wrong on GPS than the radar is perfect complement.
Somtimes you have a lot of red and green and you have to pass them with 10m, GPS 15m wrong, radar is the true pic not the GPS.
Than you use radar for passing.
It`s one of the best compelement, it`s very often i apss boats with only GPS, they are looking into GS and never looking forward, it`s like htey think that the GPS is the radar so they forget to look after boats in reallity.
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Old 21 March 2004, 07:33   #16
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"Not much more power than a mobile/cell phone"? Are you sure??? Even a small radar puts out something like 1.5kw at microwave frequencies - a mobile phone is measured in milliwatts. Radar uses a magnetron just like a microwave oven! In fact you can cook with some radar!
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Old 21 March 2004, 07:39   #17
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The WHO

I researched this for the same obvious reasons.
The WHO says this
if you want to know.
The antenna right behind your head, like you see on many pleasurecraft with a JRC, does not appear to be a good idea regardless.. ,-)

best
Janne A.
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Old 21 March 2004, 07:58   #18
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there are a couple of mistakes in that report but basically it's right - one typing mistake is that it says boat radars are 1 - 25w in power - that should have read KW - quite a difference.

Radar power does drop off exponentially - I wouldn't be worried on a normal boat but on a smaller RIB the Radar woul;d be beaming right through your head - NOT good!

Also the lack of range so close to the water makes me wonder how useful they are on a craft so fast - the higher the transmitter the better.

I would say a radar detector would be more useful
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Old 21 March 2004, 10:23   #19
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We asked from Furuno recently, how long distance have to be to the nearest crewmember when installing a 2 kW radome to our RIBs. The answer was 1 metre. The antenna is now located in A-frame, but will be lifted to upper position on later models in order to prevent radiation.

So, after all, if you are more than 1 metre from radome the radiation is not a problem. For open antennas with higher power the range is the whole different thing.
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Old 21 March 2004, 11:06   #20
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Quote:
We asked from Furuno recently, how long distance have to be to the nearest crewmember when installing a 2 kW radome to our RIBs. The answer was 1 metre. The antenna is now located in A-frame, but will be lifted to upper position on later models in order to prevent radiation.
That`s what Simrad said to me to and that`s what i mean when i say that it`s not stronger than a mobile.
Maybe i was`nt really clear.
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