The Garmin Echomap 93sv has the 77/200khz down/side Vu transducer and comes with the Lake Vu HD freshwater maps and the Echomap 94sv has the 50/200khz down /side Vu transducer and comes with the BlueChart G2 coastal maps.

The Echomaps have been selling extremely well. I would suggest checking the Garmin site to make sure your lakes are covered in the detail you may need.

Brian