
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.
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