For anyone considering an electronics upgrade, here’s what I found and conquered.
Bought the 2004 366 a few months ago on a lake I’ve never boated and the PO that promised to run through all the features of the boat and show me around the lake…well, doubt I’ll see him again. The existing (and I assume original) Raymarine C70 didn’t display anything but lines when I seatrialed. Also no maps Compact Flash card either). Fired up perfectly in the survey. Finally figured out they have a known connection issue on the screens. Took it all apart, fixed the connection issue, ordered the software update and an “old” maps card. After all that, the maps and info were still so basic, I didn’t feel comfortable sneaking into any coves and hoping it was deep enough with no submerged logs or rock walls. I’m an ex car stereo installer so not afraid to cut if I have to but REALLY prefer not to. Did tons of reading/digging and only found one post where a guy had the same same c70 and went to Simrad GO9 but no details of the install. So, I waited till the Black Friday deals and had both, the Raymarine Axiom 9 and the Simrad GO9 in my hands for about $500 ea. The Axiom has an adapter for exactly my conversion but it’s another $70 and raises the plotter off the dash. And it needs a $70 adapter to use their own (and more expensive) transducer…and could not see how detailed their Lighthouse Maps are. Figured it was going to cost another $300 vs the Simrad that just, and I mean just, fits in the same opening. The C70 cut in was rough and far from strait. I love how cleanly it fits and sits in the dash. Simrad P70 in-hull transducer plugs right in, and even has a 2nd SIM card slot for another maps card if I want. Now I can add engine data, fuel and water tank info, and battery management! I’d love to hear from anyone that’s added engine data from their 2004 or newer Volvo Penta 8.1’s, or added any other data to their MFD. I apologize in advance for pix loading sideways or in reverse order.