Compatibility: Airmar transducers and NASA duet?

[MM5AHO]

Already having Airmar tranducers feeding an ST30 Bidata, I'd like to change to NASA duet display.
But is it essential to change the tranducers? That means a lift out, and maybe enlarging hull hole etc.
Are these compatible? ie can I just connect existing Airmar jobs to the Duet?

 

[srm]

Depends on frequency used by echosounder transducers. Should work if both systems use the same frequency transducers, otherwise not. Logs usually work by a magnet on the wheel and reed switch in the body creating a pulse for each revolution of the paddle wheel. A different size wheel will give a false reading.
Try obtaining full specs for each syatem and see if the frequencies / paddlewheels match. Or, you could just ask NASA, I have found them helpful in replying to emails.