Nesis
— User’s Manual
6.4
Units
6.4
Units
Nesis uses several units for different physical quantities like distance, velocity, mass, volume,
etc. They affect the instruments and texts. The table 1 on page 38 shows which units are
available. The quantities are grouped according to their function and not to their physical
meaning.
Figure 31:
En example of units selection dialog.
Table 1:
Available units for individual physical quantity.
Physical quantity
Units
Altitude (length)
meter, feet
Airspace altitude (length)
feet only
Speed (velocity)
km/h, knots, mph
QNH (pressure)
hPa, inHg
Vario (vertical velocity)
m/s, feet/min, m/min
Wind speed (velocity)
km/h, m/s, knots
Distance (length)
km, SM, NM
Pressure (used in engine)
bar, psi
Temperature
C, F
Mass
kg, lbs
Fuel (volume)
l, gal
Fuel flow (volume flow)
l/h, gal/h
6.5
Compass Calibration
The Magu unit (magnetic compass) is carefully calibrated in our lab. However, like any mag-
netic device, Magu is affected by nearby ferrous materials as well as by local electromagnetic
fields produced by other electronic devices. Earth magnetic field (which is what we want to
detect) is combined with the unwanted magnetic fields produced by ferrous materials and
electromagnetic devices.
The calibration process can efficiently remove a large part of the error caused by the un-
wanted magnetic fields, but only if such fields are not too strong. Therefore, it is of ultimate
Version 2.0
38
©
Kanardia
2011
