MG built in transducer, down image or not?

Will the built in transducer on my Xi5 work with a down imaging unit?

For 2d only ...

There are currently no TM manufactures that include a down imaging (or side imaging) piezo in their built in xducer feature ...

Rickie

Am I correct that the MG salt water units (white ones) do not have a built in transducer?