Pcray.... I plan to use it for mostly back hills brookie fishing... The boonies... did you see your data plan sky rocket due to this?
Ha, no. We have 1 GB/month, combined for my wife and I, and we have never used even half of it. Wifi most places we use data intensive stuff on our phones.
My complaint has more to do with timing. If you gotta download maps on the fly, with a sketchy connection, it can take a while. Then you scroll, and it takes a while again. Annoying.
When at home I do my pre-planning on a laptop. When on stream, I don't use my phone as a GPS device. If I need a GPS, I take a real GPS device, the Garmin handheld type with topo maps and the like. More often I just have the rough map memorized in my head or I already know the stream. Depends on the situation. But I'd never depend on a cell phone to get myself around.
When the app gets used is usually in the car or otherwise on the go. When you aren't expecting to fish but find yourself with a few hours to kill and need to make a plan on the fly. Or when plan A crashes and burns and you need to come up with a plan B quickly. i.e. you're in an area with time to fish and you don't got a plan, or a laptop, or a wifi signal. But you got a phone, and can scan around your area and identify some options.
Last summer, for instance, I took a camping trip with the fam. Threw the fishing gear in the car but didn't really expect to fish. Didn't do any research or make any plans, didn't have any lists along, or computers. But the kid took a nap, wife wanted to do so as well, and she told me I could kill a few hours fishing. Pulled out the phone, found the nearest natural repro stream (red line), jumped in the car and went. To me, the app paid for itself right there. I didn't even know the name of the stream until after I got home a few days later. But I caught fish and was happy.