When using the sonar module, it appears that the baro still
influence the altitude reading (baro_alt in ins.c). If i set the
baro_sens to around zero, then the altitude measured with the
sonar is much more accurate (less noise). If i keep
baro_sens=23, then the altitude reading is like using the baro
alone, except that there is no drift. Is this the only benefit
of using the sonar: to get rid of the baro drift?
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