v1.03: change vibrating pattern
v1.02: fix issue in tablet
v1.01: bug fix
v0.91: update user feedback form
v0.9: add seek bar, add default ref
v0.8: various improvements, add ad
v0.65: Add back requirements for gps and Wifi location. v0.6 removes those requirements by using geocoder service. However, geocoder service does not work well. Also modify location service and help.
v0.6: Drop requirements for gps and Wifi location. Add user feedback form. Help information improvement.