Hello Sir,
I am recommending this powerful but cheap mobile gis application for android that is also available for iOs.
Overview
SuperSurv is the mobile GIS application specially designed for Android and iOS platform. Integrating with GIS and GPS technologies, SuperSurv allows you to easily collect and survey spatial data in the field with Android and iOS mobile devices.
The main functions of SuperSurv include data collection, orientation, map display and waypoint guidance. With the built-in GPS functions, the data of point, line and polygon can all be captured quickly. In the meantime, the waypoint and track can be recorded and managed to well control your directions.
Moreover, the application supports global coordinate system settings, so the files of different regions can be displayed correctly to increase the convenience of data sharing. Besides, the data of point, line and polygon that SuperSurv collects can be saved in SHP, GEO or KML formats for more advanced uses
With SuperSurv, you can:
Efficiently collect point, line, polygon data and support offline editing. Display map data with global coordinate system settings. Switch basemaps and connect to SuperGIS Server services. Create and manage waypoints with ease. Query and measure the map with GIS tools.