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Raymarine L125RC

Discussion of radars, GPS, autopilots, stereos and TV's. Also iPad and other mobile navigation devices.

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Raymarine L125RC

Postby tomschauer » April 15th, 2016, 8:56 pm

Doe's anyone know what thru hull transducers will work with an L1250? 11 degree dead rise hull.

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Re: Raymarine L125RC

Postby SplashyLady » April 19th, 2016, 10:11 am

Raymarine depth units (including the L1250) usually work at 50kHz and/or 200kHz. If you don't want to go through-hull, you can shoot through the hull with either frequency, but the 200kHz is only good to about 150-200 feet. You lose some resolution at 50kHz, but you can go deep at that frequency. What depth water do you plan to navigate? Any 50 or 200 kHz transducer will work with your unit, but you might have to adapt the cable connectors to fit the Raymarine unit if you don't use a Raymarine transducer. There are also dual-frequency transducers that have both 50 and 200 and you can switch or use both with the 1250. Many folks just keep their depth finders on dual frequency and let the electronics sort it out. I personally don't go in water over 150 deep very often, so I just keep mine on the higher frequency with better resolution and a more narrow beam under the boat.

Most companies make through-hull transducers that with a cant to allow for deadrise up to about 20 degrees, or you can cut a shim. There are also adjustable tranducers that you can set up for the deadrise you have. Think carefully about transducer location - many folks mount them toward the stern - more room to work back there, and less angle. You want the transducer to be in an area with smooth water flow over that part of the hull to get the best readings. I like the transducer toward the bow, so it sees things before versus after... :cry: Sometimes 30 feet can make a difference!

The only real downsides to shooting through the hull are a slight loss in resolution (not a big deal unless you are into serious fishing), and you don't get accurate water temperature readings if you have a transducer with a temp sensor. Carver hulls are not cored below the water line, so you can epoxy the transducer to the inside of the hull and get good sonar/bottom readings at either 50kHz, 200kHz, or in dual mode.
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