Simple coordinate converter based on the Proj4 library http://http://trac.osgeo.org/proj

Features:
coordinate conversion,
megnetic declination,
point visualization on maps/earth,
point import from MobileTopographer point lists.

Java wrapper for proj4 by Martin Deruisseaux (2011) http://www.geoapi.org/geoapi-proj4/index.html

The app includes a limited number of Coordinate Reference Systems.
Custom Coordinate Reference Systems, in proj 4 sytax, can be added to the app.
See https://sites.google.com/site/speleoapps/home/proj4

Details and contacts: https://sites.google.com/site/speleoapps/home

This app lets you to convert latitude - longitude to UTM coordinates or UTM coordinates to latitude - longitude. It is based on WGS84 projection. The calculation in this app is based on Proj4 library. You can also test the app by pressing GPS button, it can get your current location in real-time. Lat/Long & UTM Converter app can be used for Northern Hemisphere and Southern Hemisphere. Users should choose Hemisphere from the settings. This app also helps you to convert latitude longitude coordinates to degree or decimal.