Just yesterday my brother sent me an email asking me for my feedback on what it would cost to outfit a boat with electronics. He was curious because some boats listed on craigs list are turn key and some aren't. Kinda wondered the value of "turn key". Using my background in electronics and as a new boat buyer last year, I gave him the following response. Tonight I thought the info might prove helpful to others. Keep in mind that my costs are for equipment that's probably middle of the road in cost. A person could certainly spend more........or less. If I missed something, feel free to post it.
"Your question asks about electronics, and I can give that to you pretty easily. But I'll also throw in some other gear that technically isn't electronics, but the stuff is needed or wanted to outfit a boat for fishing.
Fixed mount VHF radio w/ DSC function for emergencies and an antenna w/mount. ($150 for the radio and $80 for antenna w/mount)
Handheld VHF radio for shore runs in raft and for the ditch bag. ($80)
Chartplotter/depthsounder/GPS combo w/transom mount transducer with temperature (my Lowrance HDS-5 cost about $750)
Electronic chart disc for the chartplotter (about $250)
Depthsounder/fishfinder to run so you don't have to run the chartplotter split screen fishfinder/chart (about $250)
That's about it for electronics. Total probably run you around $1500-$1600.
Downriggers (electric Scotty $360/each, manual $100-$200 each)
Downrigger mounts, cannon balls, electric outlet, line clips, etc (assuming two downriggers, approx $300)
Safety gear like life jackets, flares, water dye, extra anchor, extra props, etc ($600-$800)
Fish gaffs, harpoon, net ($200)
You can figure out the fishing rods, lures, flashers, and any other fishing gear you want.
That's about $2400 for the misc stuff
I think I spent between $2000 and $3000 outfitting my boat. It already had a Garmin fishfinder, spare props, and fenders. I added the second anchor a little later, was given a harpoon, and had a long gaff already. That's just the cost to buy the stuff and not the time you'll have to spend installing the stuff. You'll have to run cables and wires between radio & antenna, fishfinder & transducer, chartplotter & transducer, power runs for all electronics & electric downriggers, drill holes and install backing plates for the downriggers, drill holes for electric downrigger outlets, and I'm sure there's other stuff too. So it really is worth a lot to have a boat ready to go.......assuming the previous installer did a good job and you don't have to fix his shabby install work."