Bottom Finder question

Gator167 · 10-08-2008, 07:37 PM

Just a quick question. I have a Furuno FCV-582L bottom finder on my Trophy. The transducer is mounted on the starboard side of the transom, about 1 foot to the right of the outboard. Now I know that once you get up to a certain speed,all sounderswill losetheir depth finding,but mine seems to cut out at about 6to10 mph, which is kinda slow cruising speed. This makes it kinda scary when Im in thebay getting close to shore, as the depths get really shallow really fast. I can slow backdownand about stop and it will reaquire the bottom.

Do you guys think that maybe the transducer is mounted too close to the motor wash making to lose signal too fast, or is this what everybody goes through? By the way, I love the sounder andwill not replace it at this point.

Thanks in advance

Mike

lobsterman · 10-08-2008, 08:14 PM

Yes I think that is the problem. We had a reg 582 on my buddies boat and it read wide open.

snagem 1 · 10-08-2008, 08:55 PM

Generally speaking, the closer to the keel, the better the marking capabilities at higher speed.

Rockbottom · 10-08-2008, 09:11 PM

After having repowered my boat, (going from twins to a single). I moved my transducer and was having the same problem as you described. It turns out that when I attached my transducer the second time I did not have it low enough.I adjusted it down about a 1/2", to where the transducer was about 1/2" below the hull and the problem was corrected. It went from cutting out at 7 or 8 knots to now reading at up to 40 knots.

Gator167 · 10-08-2008, 11:20 PM

Good info..I may try to drop it down into the water a little more and see if it will read better. Either way, if I can just get it to read at about 25 mph, that would be fine.:clap

The Maintenance Shoppe · 10-09-2008, 11:07 AM

you should not lose the bottom at any speed going forward. It needs to be properly adjusted.

X-Shark · 10-09-2008, 11:11 AM

Look at Fig 10 on page 3

http://www.airmartechnology.com/uplo.../17-247-03.pdf

Gator167 · 10-09-2008, 01:08 PM

X-Shark,

Thanks for the link. I think if I shim it just a bit it may do the trick. I will post back when I get the results. It looks like this weekend may be a wash with the wind picking up, so it may be next weekend before I can test it out.

Thanks again guys!:bowdown

X-Shark · 10-09-2008, 02:35 PM

I usually set them so the leading edge is real close to 1/4in below the hull surface and the trailing edge is 3/8in below the hull surface.

Now the measurement would be taken on the inboard side of a deeper V hull as it has a large amount of deadrise.

But if you get feeling Froggy I can install a Airmar B-60 thruhull and that will solve your problem and really clean up the looks of your transom.

http://www.airmartechnology.com/airm...=All&PageNo=67

Gator167 · 10-09-2008, 07:48 PM

hmmm The thu-hull tranducer looks interesting. I always see those advertised and think that they are for the really big boats.Call me chickensh!t, butI always worry about drilling a hole in the bottom of my boat!!:boo

10-08-2008, 07:37 PM	#1
Gator167 Member Ruby Red Lip Join Date: Jun 2008 Posts: 93	Bottom Finder question Just a quick question. I have a Furuno FCV-582L bottom finder on my Trophy. The transducer is mounted on the starboard side of the transom, about 1 foot to the right of the outboard. Now I know that once you get up to a certain speed,all sounderswill losetheir depth finding,but mine seems to cut out at about 6to10 mph, which is kinda slow cruising speed. This makes it kinda scary when Im in thebay getting close to shore, as the depths get really shallow really fast. I can slow backdownand about stop and it will reaquire the bottom. Do you guys think that maybe the transducer is mounted too close to the motor wash making to lose signal too fast, or is this what everybody goes through? By the way, I love the sounder andwill not replace it at this point. Thanks in advance Mike __________________

10-08-2008, 08:14 PM	#2
lobsterman Jiggin Finatic Blue Marlin Join Date: Sep 2007 Location: Okaloosa Posts: 5,621	RE: Bottom Finder question Yes I think that is the problem. We had a reg 582 on my buddies boat and it read wide open. __________________ AKA Jiggin Junkie II Chronicles 7:14 Randy's Canvas & Marine Vinyls 850-279-4140 850-855-5314 cell Custom Awnings - Repairs Boat Cushions - Curtains and more

10-08-2008, 08:55 PM	#3
snagem 1 Senior Member Mingo Join Date: Sep 2007 Location: fishin' or playin' with the grand kids Posts: 176	RE: Bottom Finder question Generally speaking, the closer to the keel, the better the marking capabilities at higher speed.

10-08-2008, 09:11 PM	#4
Rockbottom Junior Member Cigar Minnow Join Date: Dec 2007 Posts: 16	RE: Bottom Finder question After having repowered my boat, (going from twins to a single). I moved my transducer and was having the same problem as you described. It turns out that when I attached my transducer the second time I did not have it low enough.I adjusted it down about a 1/2", to where the transducer was about 1/2" below the hull and the problem was corrected. It went from cutting out at 7 or 8 knots to now reading at up to 40 knots.

10-08-2008, 11:20 PM	#5
Gator167 Member Ruby Red Lip Join Date: Jun 2008 Posts: 93	RE: Bottom Finder question Good info..I may try to drop it down into the water a little more and see if it will read better. Either way, if I can just get it to read at about 25 mph, that would be fine.:clap __________________

10-09-2008, 11:07 AM	#6
The Maintenance Shoppe Senior Member Snapper Join Date: Nov 2007 Posts: 530	RE: Bottom Finder question you should not lose the bottom at any speed going forward. It needs to be properly adjusted. __________________ *The Maintenance Shoppe* Full service boat, pwc, and trailer repair 4048 Creighton Rd Pensacola, FL. 850-221-6789 www.themaintenanceshoppe.com

10-09-2008, 11:11 AM	#7
X-Shark Senior Member White Marlin Join Date: Oct 2007 Location: Pensacola, Fl. Posts: 2,870	RE: Bottom Finder question Look at Fig 10 on page 3 http://www.airmartechnology.com/uplo.../17-247-03.pdf

10-09-2008, 01:08 PM	#8
Gator167 Member Ruby Red Lip Join Date: Jun 2008 Posts: 93	RE: Bottom Finder question X-Shark, Thanks for the link. I think if I shim it just a bit it may do the trick. I will post back when I get the results. It looks like this weekend may be a wash with the wind picking up, so it may be next weekend before I can test it out. Thanks again guys!:bowdown __________________

10-09-2008, 02:35 PM	#9
X-Shark Senior Member White Marlin Join Date: Oct 2007 Location: Pensacola, Fl. Posts: 2,870	RE: Bottom Finder question I usually set them so the leading edge is real close to 1/4in below the hull surface and the trailing edge is 3/8in below the hull surface. Now the measurement would be taken on the inboard side of a deeper V hull as it has a large amount of deadrise. But if you get feeling Froggy I can install a Airmar B-60 thruhull and that will solve your problem and really clean up the looks of your transom. http://www.airmartechnology.com/airm...=All&PageNo=67

10-09-2008, 07:48 PM	#10
Gator167 Member Ruby Red Lip Join Date: Jun 2008 Posts: 93	RE: Bottom Finder question hmmm The thu-hull tranducer looks interesting. I always see those advertised and think that they are for the really big boats.Call me chickensh!t, butI always worry about drilling a hole in the bottom of my boat!!:boo __________________

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