Tinycircuits small form factor tinycircuits asd2613 r this tinycircuits tinyshield 3 axis compass features the hmc5883l high performance and low power ic from honeywell the hmc5883l includes state of the art high resolution magneto resistive sensors and features automatic degaussing offset cancellation and a 1deg to 2deg compass heading accuracy the compass tinyshield incorporates circuitry for operation over the tinyduino operating range from 3 to 5v dc you can also use this shield