My idea is to use one app already available that plot tracks from a gpx file.
gpx format that can be read by a CAD software that draw the map. Instead of using a GPS device and a booklet he/she uses a cell phone to record those IOF elements and save then on.
Choose Apple Maps, Google Maps, OpenStreetMaps, or a custom map tile source URL. My Android app is a tool to help mappers draw OrienteeringĀ“s map. The only way i can force import a gpx file is: start.