GPS Coordinates - GPS Coordinates is an app by Financept that comes up with features to help you in getting the GPS coordinates of your current location.
MAPS.ME - Fast, detailed and completely offline maps for mobile devices
FieldMove Clino - FieldMove Clino app allows users to use their mobile phones as a digital compass to capture direction data on it.
OruxMaps GP - OruxMaps GP app offers features that let you connect to the AIS information system to access useful tracks and routes for nautical sports in a variety of different nautical sports.
SW Maps - SW Maps app enables users to record points, lines, polygons, and images to view them on the desired type of map.
OsmAnd - Global mobile map viewing and navigation for online and offline OSM maps