Lowrance 27C transducer help !!!!!

OK so I bought a new Lowrance 27C this year for two reasons. My old Lowrance 16CI would not graph at speeds much past 10 MPH and the processor in the GPS would not work well with the new map chips ( Processed data way to slow ) well the new 27C solved the slow processing on the new map chips. However I still have the problem of the graph not reading at much speed. I used the old mounting bracket on the transom, so the problem may be the location of the transducer. A friend of mine ordered the same 27C and mounted his thru the hull and it read at almost any speed. I’ve had bad luck with thru hull mountings in the past so I’d rather not go that route but I also do not want to drill a ton of holes in the transom to try to locate a good position for the transducer. If I tilt the transducer forward it reads at a little higher speed bit the arch’s tilt to one side. I’m not sure what to do. Move the mount on the transom or epoxy it thru the hull. Just FYI I have a glass bass boat. Where have all of you mounted your transducers and what speed can you still get bottom readings.

Can you clarify what you’re not seeing or what you’d like to see?

I can get depth reading as fast as the boat will go, not that it “graphs” much information.

I’m looking to graph fish i’m putting along 5-10 mph and if fish start showing up i’ll slow way down to get a better look.

Do you have a mounting plate on the back of the boat? If not I would put one of those on so you can move/adjust the ducer without punching more holes in the glass.

Or have a ducer glassed in?

Jami

I think Jami is right, you need a plate on the back to mount the transducer, that will let you move it around without drilling more holes than the 2 you will drill for the plate. I also used marine grade epoxy on the back of the plate to help ensure it stuck and stayed stuck without leaking, so far so good. You should be able to pick one up at most big stores, I got mine from Gander but I think any like Cabela’s or Fleet Farm, heck and Boat place probably have something.

My other advice is to try and see if you can find some other boat owners with the same boat or same style of boat and see where theirs is mounted. You are probably close, but I bet you’re getting air under the ‘ducer somehow, according to the instructions that little line on the side of the transducer is kind of suppose to be on line with the bottom of the boat, I’ve found in my testing sometimes it needs to be a bit deeper.

I’ve also found the dual band transducer works a little better for my boat, I have a single 20 degree one on there now, it works alright, but the dual would work for me up to 50-55mph on a good day. So that’s another option though that’ll cost ya a little more. And it’s not as wide of a beam as the single, so you lose a little on the narrower beam of the dual freq transducer, It’s been a minimal issue to me, be it’s something to consider.

Both the Digital depth and the bottom graph is gone as soon as I start to trim the motor. I’d like to still see the bottom at fairly high speeds so that I could notice bottom harnness changes while moving at fairly high speeds. But I’d settle for just the digital reading. I’m not sure if I was to move it which direction I would go. Mu guess would be lower on the transom ( Closer to the motor ) I’d hate to glass it into the hull and have it work even worse. I’ve always been told that you get much better detail mounting it outside. I may just have to live with it.

If you take a pic, we can all guess together where to move it next I’m hard pressed to think that it’s not doable on the outside.

I don’t know of to many Bass guys who have theirs mounted on the outside to look at. Most of the guys who I know mount theirs inside thru the hull.

I will see if I can get a picture of it and get your thoughts. Thanks.

too true, I posted a pic on my install on a bass board I about killed a couple of them it’s still worth a try, (I’d post a question for help on Bass Boat central for a bass boat) There are some that have…

Here’s my install, though not in a suggested location, it works for my boat and motor without issue….

http://img168.imageshack.us/img168/1113/picture002lh4.jpg

http://img168.imageshack.us/img168/1319/picture006fd0.jpg

This is the dual beam ‘ducer

No offence to Nick but Walleye guys, dont mount your ducer in the center. cant get good reading back frolling in the chop with the big motor. that goes with kickers and trollers too. just thought i would try to save some .

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No offence to Nick but Walleye guys, dont mount your ducer in the center. cant get good reading back frolling in the chop with the big motor. that goes with kickers and trollers too. just thought i would try to save some .

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No offense taken

As I mentioned it’s not the ideal location, but with my boat’s layout there wasn’t and overall perfect location, when you really get her up and cranking, the boat is only riding on the pad, the further you get out from the center the less chance I have to keep the ducer in clean water. In fact Lowrance says specfically not to put the ducer where I did, it seems their concern had a bit to do with interrupting the water flow to the motor and water pump, along with possible interference, I took a shot and don’t have problems with either of those

I however don’t backtroll, I use my electric, and If I wanted to go slow, and if I wanted to use my big motor at slower speeds, I’d use a drift sock, but you are 100% correct in looking at the situation, it will depend on how you use your boat.