Std one (P66 transducer) will work OK'ish up to 150-200m. So if you are mainly fishing 100m or less 90% of the time then it will do the job. If you were fishing deeper more often then you would / might be disappointed, .
the 627 is a 600w sounder but if you stick a 1kw transducer it will work nearly as well as a true 1kw sounder as the bigger transducer has a narrower beam angle and "focuses" the energy better and is more sensitive.
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