Quote Originally Posted by tmb View Post
ordering new boat Thursday and thinking about upgrading from the df that comes with the boat to a 899.my question is will this unit give a reading when on plane so you could use for navigation also.dont know a lot about these si units but have read they do not read well at high speeds.
There are a few advantages to using a shoot thru the hull 2d xducer and the AS SIDB Y cable....

*Less finicky when installing the HDSI xducer...
*Mounting the HDSI xducer up higher on the transom to keep from knocking off that $270 HDSI xducer from underwater obstructions...

Rickie