# Design for Exercise 23 Magnetometer

directory exercises/23_magnetometer contains code which will take calibration readings and store the calibration samples on the SD card drive as file magnet_cal_YYYYMMDD_HHMISS.log.
The log should have a provenance header starting with hash tags such as:
     # this file name:
     # magnetometer mode:
     # sample rate:
     # Software name & build date:
     # GPS coordinates
     # 

Location services via GPS
Disciplined time with update if 24 hours since last disciplining.  See Excercise 11
Web services, including download and erase shall be included.
