This Compass module makes it possible, for example, to determine your position digitally during a search, fishing on large water, sailing trips, geocaching, fox hunts, droppings and many other purposes.
The Module is very small and works via I2C, the power consumption is very low and the supply voltage may vary from 3.3 to 5 volts.
The Sensor is based on the HMC5883L Chip. You can download the datasheet for this below
HMC5883L Sensor (Tripple Axis Magnetic Field Module)
Power supply: 3-5V Communication I2C
Measuring Range: ±1.3 to 8 Gauss Size: 13.9*18.5mm
Compass Sensor Tripple Axis HMC5883L, economical and efficient!