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Garmin 740S or 546S for deep dropping.

Old 09-30-2011, 12:24 PM
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Default Garmin 740S or 546S for deep dropping.

Has any one used a Garmin 740S or 546S with a 1kw transducer for deep dropping. My Garmin 192C with GSD20 and transom mount transducer needs to be replaced and I don't have the space(or money) to have a separate 1kw fishfinder. I would like to have better bottom definition in the 600-900 ft range and be able to see the depth from 1400-1800 for swordfishing. I am open to alternatives if there is any combo units that will do what I am asking.
Thanks,
T.
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Old 10-01-2011, 07:56 AM
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I b have. The 740s. Just put on the 1kw transducer. The 800 w did good up to about 1200'.
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Old 10-01-2011, 10:07 AM
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I have outfitted quite a few 740S units with Tm260/ B260/ M260 /SS264N transducer configurations for customers.

The average working depths (Working depth=constituently getting reliable targets) seem to be around 1200' and some... under very good conditions...but I personally think the Garmin 740s circuit is not the best overall sonar for really deep fishing on a steady basis..(1500' to 2000')

The 740s seemed to be at its best in 1000' or less...according to my customers feedback...which of course is subjective as there are so many factors that affect sonar when going really deep.

Last edited by semperfifishing; 10-01-2011 at 10:55 AM.
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Old 10-01-2011, 01:04 PM
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Thanks semperfifishing,
I have learned alot from reading your posts.
I think that the Garmin 740S is my only option with out spending another thousand dollars more.
It appears that the 546S has the same sounder, do you know if this is true?
Thanks,
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Old 10-01-2011, 02:26 PM
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Originally Posted by surfrat580 View Post
It appears that the 546S has the same sounder, do you know if this is true?
Thanks,


The answer is yes..both sonars have the same basic transmit & detection circuit.

I am going to PM you a photo of a jack leg transom mounting for the Tm260..it allows you lower the leg into the water another foot while trolling..thus better depth and sensitivity.
PM sent.

Last edited by semperfifishing; 10-01-2011 at 02:40 PM.
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Old 10-04-2011, 06:49 AM
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Thanks for the picture, I have never seen anything like that. I am afraid that I would forget it was down and break it off when I speed up, so I think I will go with TM260 mounted on the transom.
You have the best price I have found, so I will order from you when I pull the trigger.
Just curious, what does the jack leg cost?
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