E7 Hybrid & HDS. Gen2

Gentlemen i have an issue to overcome with some assistance please.

Boat had a Raymarine E7 Hybrid on it when i bought it & seems to work ok.
I have a HDS7 Gen 2 in my tinny with structure scan etc.

Going to bounce the HDS between both boats so on the bigger boat i have two 7 inch screens so i figure the Raymarine would be best suited for charting & the HDS as a dedicated sounder.

Question - Based in Port Douglas most of our time is within the reef due to weather and some of the time out wide so what Transducer or Transducers would be best suited.

Thanks in advance..