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Sunlight readable screens come in two flavors: Small, or damned expensive. Tablets won't be easily readable, neither will cell phones, so you're left with purpose-built GPSes and chartplotters which are going to be expensive.
The alternative is to sail at night. Or wait five years for new screens to come out.
Pretty much all the GPSes today will have WAAS, but DGPS is uncommon in the civilian market. WAAS accuracy is best on the east and west coast, where the corrections are based. In the heartland...I think you'd find the stated 3-meter (+- ten feet, for a 20 foot potential error) accuracy might be stretched simply because you are at the extreme edge of the correction area.
So you're left with buying a marine GPS that suits your prices and has charts for your lake, and you'd probably better put avoidance zones a good 20' outside the spots you want to avoid. Assuming you respond to those alerts instantly.
That's just where it is.
One thing you may want to look at, if you don't wear precription sunglasses, they now sell sunglasses with bifocal reader lenses in them. Small ones in standard diopters, $10-15 in the flea markets and discount stores, just for purposes like this.
If you have rx or favorite sunglasses without a bifocal, look for the "stick on" vinyl bifocal lenses, about $25-35 online and hard to find in stores. They stick on to your glasses and they're incredibly effective for driving or boating, where you need occassional reading vision at arm's length. People think they have to be crap. Nope, they're actually incredibly good. And best of all, you get to position them exactly as high as you want them, or as small and low as you want them.