The HMR3000 Digital Compass Module measures fields within 1 gauss in magnitude. Computer floppy disks (diskettes)
store data with field strengths of approximately 10 gauss. This means that the HMR3000 is many times more sensitive
than common floppy disks. Please treat the compass with at least the same caution as your diskettes by avoiding motors,
CRT video monitors, and magnets. Even though the loss of performance is recoverable, these magnetic sources will
interfere with measurements.
The fluidic tilt sensor works best when kept near level, and in calm to moderate vibration conditions. If turned upside down
or violently jarred, not all the fluid will immediately return to the bottom of the tilt sensor’s glass ampoule. Accurate tilt and
tilt compensated headings may be unavailable for a minute or two to allow for the fluid to transit to the bottom of the
ampoule.