Reply
 
Thread Tools Search this Thread
 
Old 15 September 2002, 11:28   #1
Member
 
Country: UK - England
Town: Great Harwood, Lancs
Boat name: Tigger II
Make: Bombardier Aerodeck
Length: 3m +
Engine: Tohatsu 25HP
Join Date: Jul 2001
Posts: 626
Radar is it worth it ?.

Just trying to spec the nav and electronics set up for my new RIB.
I cant decide if radar is worth it on a RIB, low scanner height, covering ground fast etc.

Does anyone have radar fitted if so how usefull is it, was it worth fitting ?.
Also any other commenst on radar in RIBS welcome.

Regards Gary(going to be poor after the boat show) Greenwood
__________________

__________________
Garygee is offline   Reply With Quote
Old 15 September 2002, 12:11   #2
RIBnet supporter
 
Brian's Avatar
 
Country: UK - Isle of Man
Town: Peel, IOM
Length: no boat
Join Date: Nov 2000
Posts: 2,277
RIBase
I think it is.
Mainly in fog/mist and at night.
But also v. useful for giving highly accurate distance and bearing data of various objects (fixed and moving). For moving objects it will also tell you their speed and bearing.
Mounted on a rib, there are of course many limitations. But, when trying to drive through thick fog in busy traffic areas, it can be invaluable.
I would counsel the following:
-get an enclosed array scanner i.e. the bit that goes round and round is enclosed in a GRP housing. (many, obvious reasons for this)
-make SURE you get one that has an ARPA or MARPA facility. This allows you to mark another vessel on your screen. The software then tracks that vessel continually updating data such as collision info. Most systems will track up to 10 "targets" simultaneously. Whats more, it will do it much more accurately and faster than your eyeballs and brain!
-Make sure your scanner is mounted high. Above any possible zapping range of your, or your crews head, and away from other antennae etc. which may mask it's signal.
-Do not expect to be able to pick up other small boats.
-Make sure that the screen orientation is firmly in your mind and preferably is the same orientation as any mapping plotter you may have.
-If you are using a mapping plotter AND RADAR make sure they are both set to the same scale.
-If like me, you get TERRIBLY BORED on long voyages, it's a great "other" toy to play with!!
__________________
Brian is offline   Reply With Quote
Old 15 September 2002, 12:21   #3
Member
 
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,835
I've looked into it, decided it's a great idea and i want one, just 'avent got room on current boat really.

Remember something about GPS aeriel needing to be mounted higher than radar - that makes sense really 'coz GPS is looking almost straight up i think.
__________________
Daniel is offline   Reply With Quote
Old 15 September 2002, 13:25   #4
Member
 
Country: UK - Scotland
Town: Highlands
Boat name: Quicksilver
Make: Quicksilver
Length: 3m +
Engine: Mariner 15hp
Join Date: Aug 2001
Posts: 1,771
Hi

As far as I am aware GPS will look right down to the horizon. I say this because when you turn to the satelite screen it shows you which satelites it is locked onto and their height above the horizon. This is why it needs to be high so nothing else on the boat obstructs it. Modern GPS lock onto up to 12 satelites - hence Garmin 12.

Keith (ready to be shot down on this) Hart
__________________
Small boat - BIG truck

www.photo4x4.co.uk
Keith Hart is offline   Reply With Quote
Old 15 September 2002, 13:40   #5
Member
 
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,835
Sounds right keith - looks like we agree on it needing to be above everything else - i wonder what the radar picks up if you use a stainless extension pole to mount tge GPS aeriel on?

Don't always follow the rule though - my handheld is a GPS 48, but still a 12 channel parallel receiver. 12 is the maximum number of sat's the unit can monitor at once (in terms of the electronics). This number is derrived from the earths geomatry vs. the number of satellites and 12 is the max. you can ever see at once. From memory there are 24 in total plus 3 spares, there is quite a bit on this in the front of the almanac - including the all important translation from various datums (WGS 84 for GPS i think).

Dan
__________________
Daniel is offline   Reply With Quote
Old 15 September 2002, 13:58   #6
Member
 
Country: Other
Make: FB 55
Length: 10m +
Join Date: May 2001
Posts: 1,711
The GPS antenna has no height restrictions, as long as it has a clear line of sight to the sky.

I have had radar on three of my various boats and had cause to use the radar on only two occassions in 7 years?! That said, anything that aids safety at sea, if you can afford it, is a good thing!
__________________
Charles is offline   Reply With Quote
Old 15 September 2002, 14:56   #7
Member
 
Country: UK - England
Town: Bromley, Kent
Make: GS209
Length: 6.137
Engine: 4.3ltr 210hp Volvo Penta
Join Date: Sep 2002
Posts: 231
Just for your info, I use a handhelp Garmin e-map GPS on the windscreen succer in my car for years, it is obstructed by people, metal (roof), glass e.t.c. and never fails to give me a perfect signal, apart from the Dartford tunnel!

I imagine it is all the same, has to get a lock on three or more of the twelve. I don't see a difference between a RIB with no roof and a car.

My first bit if partly useful info,

Pete
__________________
Flanker is offline   Reply With Quote
Old 15 September 2002, 15:51   #8
Member
 
Country: UK - England
Town: Poole
Length: no boat
Join Date: Jul 2001
Posts: 673
Radar is one of those things that you will probably never need depending on your luck !

Twice this year, once in Lyme Bay and once off Jersey I have been in thick fog ( <100m vis ) and I can assure you without radar it would have been a big issue.

Off Jersey it was driving on gauges only, so the combination of GPS and Radar was indispensable to making a safe passage.

Not up on the costs but I suspect that a Radar comes in at less the 1000. If you have the money and space on the console go for it !

Regards

Mark
__________________
MarkWildey is offline   Reply With Quote
Old 15 September 2002, 15:56   #9
Member
 
Country: UK - England
Town: Margate / Ramsgate
Boat name: Ballistic
Make: Ballistic
Length: 7m +
Engine: Yam HPDI 250
Join Date: Feb 2002
Posts: 2,835
Just for the record i was considering a JRC 1000, and was quoted 599.

It had a 6" LCD and a 1.5kW 12" spinny bit - not sure if it has the aforementioned features though.

This is the only link i can find in my favorites... http://www.bethel-marine.com/JRC_Radar1A.htm
__________________
Daniel is offline   Reply With Quote
Old 15 September 2002, 16:41   #10
Member
 
Country: UK - Scotland
Town: Isle of Skye
Boat name: Seafari - VHF CH 71
Make: Humbers+Catamaran
Length: 6m +
Engine: Volvo/Iveco/Suzuki
Join Date: Feb 2002
Posts: 196
Radar

I originally was gonna put a radar on the 8.5 - and am glad i didnt - depending on what size rib its going on, i would almost gaurantee it would shake itself to bits on the a-frame??

I have been out every day (weather permitting) since easter, and would have used it once - get a good gps plotter instead.

You will also find that the warranty on a new radar will not be covered once the makers find out it was on an aframe .

Wait for the mist to clear (always best to look at this from the inside of a pub?)

Pete F
__________________

__________________
seafariskye is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 07:19.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.