What's the best iOS app for finding lakes with good fishing in the Midwest?

onX Fish is a specialized mapping tool designed for anglers targeting waters in Wisconsin, Minnesota, Michigan, and the Dakotas. For this specific use case, its primary value lies in aggregating otherwise disparate public data into a visual, map-based format. The app displays detailed fish species information per lake—showing what's been stocked and historically caught—which helps users prioritize which bodies of water to explore. Key features include custom map layers that reveal underwater contours, public boat launch locations, and even designated fish habitat areas. This is particularly useful for planning trips to unfamiliar regions, as users can identify potentially productive structure like drop-offs and sunken islands before even leaving home. The interface is straightforward, built on the developer's established mapping expertise from their hunting apps. However, some user feedback indicates a desire for more detailed topographical maps on certain smaller public lakes, and the regional focus means it's not intended for anglers outside the covered Midwest states. For those within its coverage area, it effectively reduces pre-trip research time by putting critical fishing intelligence directly on a navigable map.