Flymaster GPSm, Руководство пользователя

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Page 48
Flymaster GPS M User Manual v. 1.0
Set Altimeter
The Set Altimeter page, allows the user to adjusts the barometric altimeter. A barometric
altimeter calculates altitude based on atmospheric pressure, and should not be confused
with the GPS altitude, which is calculated based on satellite information. Since
atmospheric pressure can vary substantially with meteorological conditions, and so with
time, the barometric altitude also varies according. In order to have the correct altitude for
a certain place the altimeter should be calibrated. Altimeter - Calibrating the altimeter can
be achieved by entering the know altitude of the location. Entering an altitude
automatically calculates the QNH, which is the local barometric pressure adjusted to sea
level.
QNH -
Alternatively, the altimeter can be calibrated by adjusting the QNH for the local,
and time. Changing the QNH will adjust the barometric altitude. Altitude can also be set
from the GPS.
Get from GPS -
Get from GPS field which can be set to Yes No or Auto. Adjusting this
value to Yes will make the GPS M take the altitude from the GPS and adjust the altitude
accordingly. The Yes is not stored in the setting, since it is a one time only operation. The
Get from GPS can also be set to Auto, with this value being stored in the settings. When
Auto is selected, after being turned On, the GPS M will automatically set the altimeter to
the GPS altitude (once a valid GPS signal exists), or whenever the pdop value is lower
than the previous one. Note that position dilution of precision (pdop) gives you an
indication of how reliable the GPS altitude is at the moment. The lower the pdop value
the more accurate the position fix