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Author Topic:   Depthsounder Bottom Echo at Speed
palerider636 posted 08-31-2008 12:50 PM ET (US)   Profile for palerider636   Send Email to palerider636  
I own a GARMIN 198 c depthsounder. If a go over 7-MPH my depthfinder shuts off and it's costed me a prop so far.
Bella con23 posted 08-31-2008 01:42 PM ET (US)     Profile for Bella con23  Send Email to Bella con23     
Start here -
palerider636 posted 09-01-2008 02:14 PM ET (US)     Profile for palerider636  Send Email to palerider636     
Ya it's mounted the right way but it was loose in the mounting bracket so I glued it togather so it wouldn't turn up and now I get to 20-22 mph before it shuts down and just blinks the depth it was last on.
jimh posted 09-01-2008 09:48 PM ET (US)     Profile for jimh  Send Email to jimh     
You need to get that transducer mounting squared away before you lose another propeller.
Hoosier posted 09-02-2008 08:40 AM ET (US)     Profile for Hoosier  Send Email to Hoosier     
I have the same problem with my Garmin 240. Try lowering the transducer so it is 1" below the line of the hull, and make sure it's level with the boat's bottom. If your boat planes with a bow up attitude try a transducer tilt position that is a compromise between level with the bottom at slow speed and level with the water when the boat is on plane.
jmorgan40 posted 09-02-2008 10:36 AM ET (US)     Profile for jmorgan40  Send Email to jmorgan40     
I have always had problems with the Garmin transom mount transducers running at speeds. My previous Montauk would loose the signal around 20 knots and I loose the signal on my Outrage around 18-20 MPH. I also have my Lowrance LCX-26C and it holds the bottom signal at over 40 MPH.

I know folks with Garmin thru-hull setups who have no problems but my personal opinion is that their transom mount transducers are not very aero-dynamic going through the water.

alfred posted 09-05-2008 08:41 PM ET (US)     Profile for alfred  Send Email to alfred     
Placement is important. Have a Navman/Northstar 6500 on the 18 Classic and it will read bottom in 44meters of water at WOT (34knots). The outer edge is only 3mm below the hull line.
glen e posted 09-05-2008 11:29 PM ET (US)     Profile for glen e  Send Email to glen e     
take the unit off "auto" and turn up the gain when at speed...

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