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Old 26 February 2004, 15:10   #11
Country: Finland
Town: Tampere
Make: Atlantic 21, Avon SR4.0
Length: 6,9 m
Engine: Mercury F60 EFI x2
Join Date: Dec 2003
Posts: 117
GPS & Echopilot

For Nik: Echopilot doesn't work in RIBs at all. Basically the forward-looking sounder works only in slow heavy-displacement boats. In planing craft it works up to approx. 10-15 knots - in RIB I think speed range is even narrower. So I'd suggest to forget Echopilot except in very large and slow RIBs.

GPS antenna and radio aerial can be in relatively close installation. I have had no problem in several boats that have both aerials inside 1-2 ft range. It's just some kind of like warranty thing, in theory the aerials may interfere with nearby signals, but in practise there's no problems.

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Old 27 February 2004, 02:40   #12
Country: UK - England
Town: Saltash, Cornwall
Make: Rib less:-(
Length: no boat
Join Date: Sep 2002
Posts: 693
if you have a look on the yachty (mby?) forums there has been a lot of discussion on this.
Basically its possible that when you Tx on the VHF you can interfear with the reception on the GPS.

Weather this is limited to GPS's with the reciever in the antenna as opposed to the plain antenna with the reciever I don't know.
Or people trying to mount everything at the top of the mast?
Or interfearance from long cheap cable runs running together not sure, but as many have said before cheap cable is a false econamy .

Well thats my 5 pence for the moment off to find the spell checker!!

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Old 27 February 2004, 03:09   #13
Country: UK - England
Town: ramsgate
Boat name: Micki Dee Bee
Make: Ribcraft Seasafari
Length: 9m +
Engine: Twin 250hp Suzuki
MMSI: 235057235
Join Date: Jan 2004
Posts: 1,622
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VHF antenna

We (as will most radio people) you should not have anything within approx a meter of your VHF antenna. More space the better.

This is not always practical on any boat.

With Ribs it can be easier.

If the boat has an A frame I will site the VHF on one side and the GPS on the other. If possible antenna cable on apart. One down each side of the boat.

Compas safe distance 1M, this is because of the speaker in the radio (has a big magnet).

Its just good working practice.

GPS's are very electronicly noisey.
Have seen lots of cases where they are sited to close to a radio or antenna cable run beside each other and you get "noise" on the VHF.
Re-route the cables and/or move the antenna apart problem solved.

Radio can be a black art.
Taken me years to get it right!!!!!!!!!


Jon Brooks VSMM. Marine Mammal Medic, PBI, SRC Assessor,PWC Instructor.
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