Take care of the heading accuracy

Very nice app : intuitive interface and usefull tools.
But the poor hardware accuracy of the gyro/compass (1°) makes it useless for serious measures.
For example, the distance approximation of a triangulation is :
2% for two ref-points at 90°
6% for two ref-points at 30°
16% for two ref-points at 10°
30% for two ref-points at 5°

TobiasDes about Theodolite, v5.0