This document discusses inexpensive mobile mapping solutions that are compatible with both Android and iOS platforms. It introduces the Avenza PDF Maps, OruxMaps, and CarryMap Observer applications. Avenza PDF Maps allows users to load georeferenced maps and record location data. OruxMaps enables users to create waypoints, tracks, and share locations between devices. CarryMap Observer is more full-featured, allowing customization, identification of map features, and data collection capabilities. The document provides an overview and demo of each application.