Does anyone know of a node that can be used as a simple compass (i.e. to derive its simple magnetic heading)?
Is the only option something like the RAK2700 tracker? (which is a bit of overkill, but it has 3 magnetometer readings).
Can anyone recommend a better device?
If the 3 magnetometer readings are the only option, how does one process these readings to derive the magnetic heading in the horizontal plane?