What's the best iOS app for comparing multiple hiking trail maps side by side?

GeoTrails MultiView is a navigation app designed for outdoor enthusiasts who need to visualize and compare various map sources in real-time. Its core functionality centers on a multi-view interface that allows users to split the screen into separate panels, each displaying a different map type—like OpenStreetMap, USGS topographic data, or satellite imagery. This is particularly useful for hiking scenarios where trail accuracy varies between sources; for example, users can overlay a detailed topographic map with a satellite view to identify potential obstacles or verify trail conditions before venturing out. Features include customizable layer opacity, offline map downloading for remote areas, and GPX file import for pre-planned routes. Reviews indicate that the app simplifies complex route planning by reducing the need to switch between apps or tabs. However, some users report that the interface can feel cluttered on smaller iPhone screens, and offline maps may consume significant storage space. Despite these minor imperfections, the app's ability to synchronize multiple views with GPS tracking makes it a reliable tool for pre-hike preparation and on-trail navigation, especially in areas with limited connectivity.