microHAM ARXC.REL Quick Start Manual page 12

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Hardware status
To signal basic functionality of ARXC.MAG, LED inside module indicates polarity of the X
component of uncalibrated measurement of magnetic vector. In other words, LED is on, if the
general direction of terminal block of ARXC.MAG is towards North.
Besides that, LED indicates also presence or absence of communication from ARCO: if ARCO
communicates with ARXC.MAG (i.e. during rotation, or in the Menu->System->ARXC.MAG
screen, or in Menu->Heading->Calibration screen if ARXC.MAG is selected as primary sensor),
LED blinks once a second, otherwise it blinks once in 5 seconds.
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