Fish finder at high speeds

[almo100]

I have a logic 17cc and I was wondering if you have heard of anyone successfully using a fish finder at high speeds. I have a Raymarine DS400 (500 watts RMS) and it works great at slow speeds. I would like to know if it is even possible with a Logic 17 footer before I spend hours adjusting the transducer and drilling holes. I have a transom mount transducer and according to Raymarine it is rated to read bottom at 70 mph. My boat has a 50hp Honda four-stroke and maxes out at about 30 mph.

 

[Genelie]

I have the great solution, why you ask....because I have had the same problem. Hee hee # 1 if you have a manual mode use it. this allows you to preset your gain and signal levels. In auto...they are set to high. # 2 the instructions say to have the sonar about 1/8 below the hull of the boat..FORGET that. I have mine after many trial and errors, approx 3/4 - 1 inch. It is almost like haveing a through hull. WORKS AWESOME now. Even at high speeds. I still get a bit of garble now and then . But for the most part, I get great readings. my unit is a Furuno 582 = 600 watts of power

 

[fridaysoff]

ALMO100,
I just replaced a b/w Lowrance with a color 178C Garmin on my 170CC a few weeks ago. I had a lot of garble with the old one, but the new Garmin is crystal clear at WOT. I was really suprised and glad that it was so clear. I had to change transducer's also, but I melted a little Ropolene and used a small putty type knife and closed the old holes pretty good.
John D.

 

[almo100]

Thank you very much for all of your input. I was wondering if you could let me know where on the transom you put your transducer. Raymarine says to put the transducer on the right but I had put it on the left since that is where my old one was. I'm not sure how much a difference it makes but I was wondering if you could tell me how many inches from the center you installed your transducer and what side did you put it on?

 

[Genelie]

(suitekids quote)any lower and it flipped up at sppeds close to 50 (WOT) when the Xducer was deeper.

Wow...Mine is 3/4 0r more below the bottom...then again my boat can 't go that fast..max speed with wind at my back is 40. On the ocean....I don't even need to go that fast.

 

[Genelie]

yes being able to that fast if you need or want would be nice....But alasss, i was sold a boat with a small motor

 

[Eric G]

Ditto here w/Lowerence 522, lose bottom at WOT

I think is cause of bubbles from the drain holes in the front Bow compatments. They have indentations (like air scoops in the hood of a car) in the hull to force water up the drain holes if using them for fish holds. The bubble trails fall right in line with my transducer mount location (DUH!)

 

[ILLOGICAL GGC]

i have the ds600 and my transducer has a little rooster to it but i can see thru the full range of speed

ease it down some more and see if it helps