I am about to order a 899 unit. Of all I have read, exchange the transducer for the HD model. May have problems with the 800 Hz until Hummingbird gets it fixed or have they done that yet. I have a Ranger 185vs, on all the new big rangers they have the transducer thru hull. Is that something that I should consider or just mount to transom. If anyone has pics of mounting transducer on a ranger please send. The boat has an indash garmin (junk but reads depth and its a shoot thru hull) will it interfere with the 899 unit. The Ethernet hookup is it simple or do you have to have other parts to make it work (probably gonna get another next year). Will the transducer for the 899 interchange for the 999 unit if decide to go bigger.