I do wonder how accurate those maps are, and how often they are updated. I've used Google Earth to find spots to fish, just wish it showed water depth and underwater obstructions.
I found an app called "Fishidy", I think you can pay $50 or $100 a year and get access to all kinds of underwater wreck/obstruction data. I think it's more up-to-date than the H&L maps, but I use Google Earth to confirm. My process is:
- Find obstructions that are marked on Fishidy,
- Use Google Earth (earth.google.com) to zoom in as much as possible, and see if you can see anything. You can mark the points yourself on Google Earth, and save them as a project. Then you can have all of your research with you on your phone when you go fishing.
- For extra credit, download Google Earth Pro (free) for desktop. They have historical data -- this is useful because you'll get lucky (sometimes!) and find days where the tide was really low, or the water was really clear.
I like Google Earth for another reason -- if you don't have a boat, you can tell where fences are, so you can find places that are public (or, more often, "public-ish"). I'm currently poring over a bunch of urban ponds around Austin, looking for bass fishing places
But I've used this method to re-examine places that I grew up fishing (Surfside, West Galveston Bay, Matagorda) to find places I didn't know about. One example, I'd never fished this little stretch of bayshore (I'd fished about every other adjacent piece of bay shore!), but you can see some
AWESOME potholes here. Last time I was back in Galveston I nabbed some nice specks and reds fishing them
Hope it helps!