[CA] sidescan only reads port side with sterndrive down

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum snakedriver,

I too have a boat with Mercruiser Alpha 1 propulsion. The fore/aft beam angle of the SideVision transducer elements is quite narrow as specified within the referenced FAQ. On my own boat, I too find that SideVision can be obscured to port when the drive unit is fully down. This would be expected for outboard and I/O powered vessels when the transom mounting surface to which the outboard or outdrive has been mounted is the same as that to which the transducer has been mounted. In the case of many, SideVision to port may improve when the outboard or outdrive is raised to be no longer within the fore/aft beam angle of SideVision transducer elements. Such is the case onboard my own boat. Unfortunately, should raising the drive not provide vision to port then little more could be recommended. To leave no stone unturned, should you attach a photos of the entire transom, the side where the transducer is located, and view from the side of the transom (looking to port) in which the transducer and outdrive full trim (not tilt) up position, the we may be able to provide alternative suggestions.

Were the MFD to be replaced with an Axiom RV MFD or Axiom Pro RVX MFD and the CPT-200 to be replaced with a RealVision Transducer located in the same mounting location, I would expect similar obscuring of the system's SideVision imaging with your vessel.