Concept is good....needs work, but it's a start.
When it comes to fishing spots and maps, I think of Vince Lombardi saying to the effect of letting the other team have his playbook. He'll still beat them, because execution makes the difference.
For one...you can plop lots of people down on a "hotspot" and they won't catch fish because they won't use the right technique.
For two...the stereotypical "online angler" lives in "The City" and is either going to look for the closest spots to home, or is going to spend a day driving to some secret brookie hole listed online, only to find that the road GoogleMaps shows going in there is actually a snowmobile trail 5kms away from the lake.
This will just be another tool in the endless search of where to fish next