Moderated Discussion Areas
ContinuousWave: Small Boat Electrical
Depthsounder Bottom Echo at Speed
|Author||Topic: Depthsounder Bottom Echo at Speed|
posted 08-31-2008 12:50 PM ET (US)
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.
posted 08-31-2008 01:42 PM ET (US)
Start here - http://continuouswave.com/maintenance-logs/transomTransducer/
posted 09-01-2008 02:14 PM ET (US)
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.
posted 09-01-2008 09:48 PM ET (US)
You need to get that transducer mounting squared away before you lose another propeller.
posted 09-02-2008 08:40 AM ET (US)
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.
posted 09-02-2008 10:36 AM ET (US)
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.
posted 09-05-2008 08:41 PM ET (US)
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.
posted 09-05-2008 11:29 PM ET (US)
take the unit off "auto" and turn up the gain when at speed...
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