Simrad NX40 - 18-13 Setup > Calibrate

Simrad NX40/45 Installation and Operation Manual 91
Note: that the units for wind speed are
the speed units.
Pressure Requires SmartCraft: kPa or psi
Baro Requires a VHF receiver with barometer
connected by NavBus: InHg or mB.v
18-12 Setup > Comms
Use this feature when the unit is connected to other Simrad
instruments through any compatible NMEA instrument.
> Comms
NMEA out NMEA is generally used with third party
instruments. Select this to transmit
NMEA sentences, for example to an
autopilot.
NMEA data Use this to specify which NMEA
sentences will be transmitted.
Lat/lon d.p’s Select the number of decimal points
used for latitude and longitude
transmitted in NMEA sentences.
18-13 Setup > Calibrate
> Calibrate
Speed This calibrates the speed from a
paddlewheel sensor connected to
the unit. Calibration may be required
because different hull shapes have
different flow characteristics.
Note: for accurate calibration, The
speed from a GPS receiver should be
greater than 5 knots, and the speed
from another paddlewheel transducer
should be between 5 and 20 knots.
Best results are achieved in calm
conditions where there is minimal
current (best at high or low tide).
Calibrating speed Travel at a constant, known
speed.
To calibrate speed
Speed >
> change shown speed to the true value >
Speed filter Waves and wind cause the boat speed
from the paddlewheel transducer to
fluctuate slightly. To give stable readings,