In my experience fishing Suisun Bay, your eyeballs, the chart and a simple fish finder are all you need to find sturgeon. They go up onto the flats on the flood and drop off as the tide goes out. They show most when the tide is running and when they do, anchor up a hundred yards DOWN current and in line with where they showed, put your bait out and wait. We've caught fish in 4' of water doing this and are always on the ragged edge of getting stranded on the flats till the tide comes back in.
They back down facing into the current so if you get up current from where they showed they are actually moving away from you all the time. Pay attention to the little channel depressions that you can see on a minus tide, remember where they are and anchor at their mouth where they drop off into the deep channels when you see fish show on the flats up slope from those "slots" on the flood and just wait during the outgo. You'll sometimes get bump "bites" with nothing there when you set the hook because the fish hits your line as it moves past it. They have to pass it and then come back to it.
Just be observant and you'll get on all the fish you want. It's a lot like golf in that you can't buy a good game just by getting more expensive equipment. Success comes with practice and observation.