Nielsen-Kellerman ClearNav - Manual (Page 27)

NK ClearNav Manual • Version 0.5 • July 3, 2008
Page 27 of 86
2.1.10.2 Cambridge Aero Instruments 302
The Cambridge 302 is a great companion to the ClearNav. The following data can be received from the
302:
• Vector Wind (speed and direction)
• Real Time Headwind
• True Airspeed from the 302
The Vector Wind (speed and direction) and Real Time Headwind can be displayed on the map screen.
The Vector Wind is used for final glide (as the auto wind) if it is available. The wind information
supplied by the 302 is a little more accurate and can be calculated when cruising as well as when
circling by comparing the True Airspeed to the GPS measured speed and direction. Without the 302
the ClearNav calculates wind using wind drift while circling. To display the Real Time Headwind
received from the 302 simply enable that option under Personal Preferences / Map Display / Wind and
Bearing / Head wind Component. The 302 supplied True Airspeed is used for the total energy final
glide computation. When not connected to a 302, the airspeed is calculated using the measured wind
and ground speed.
The Cambridge 302 can be connected to either of the RS‐232 serial port connectors on the Nexus
Wiring Board. The Cambridge 302 to Nexus Board Cable can be used for the connection. It is shown
below. A Y‐cable for connecting the 302 to both the ClearNav and a panel mounted connector for PDA
or PC is also available from Cumulus Soaring, Inc.