This application uses both google maps method and classic compass method. So it is too easy to solve the Qibla angle with this app.
In our algortihm we measure also world deviaton. We get latest deviation calculation from NOAA National Geophysical Data Center (NGDC) of US. internet is required calculation.
Outside of Europe Middle East Region (EMEA) internet is compulsory for correct compass calculation due to the deviation of our planet.
Muslim prayers may use this compass algortihm with their android phones and tablets. We are working hard to support all location.
Using gps sensors it is possible to calculate the correct qibla angle especially for Europe and Middle East, but outside of this places are recommended to use google maps algorith or may use predefined city records.