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CAMBRIDGE
INSTRUMENTS
L-NAV
FLIGHT COMPUTER
The
Standard of Excellence in Final Glide Computers
The
LNAV flight computer is found in more gliders than any
similar product worldwide. This unit is fully integrated
with GPS models 20 and 25. Simple, straightforward and
easy to use, LNAV is the performance leader of the industry.
The
L-NAV's Custom display puts all the important information
on its Main Screen. Clearly labeled secondary screens
simplify data entry. Advances pioneered by the Cambridge
S-NAV have been incorporated. These include:
-
Digital Altimeter
- Graphic
Glide Slope Display
-
GPS Compatibility
-
Automatic climb/cruise switching based on our "G"
meter
- Two
Stage Climb Audio based on MacCready Setting
- Climb
optimization based on G-Meter and Airspeed
-
Elapsed time clock
-
Full Function Repeater for 2-seat sailplanes
Cambridge
advanced technology makes the L-NAV the most cost effective
NAV computer on the world market today. We have manufactured
and sold more than 1000 L-NAVs since 1991, and every
one of those instruments can be upgraded to this latest
version. In fact, this upgrade can be done by the pilot
with nothing more than a screwdriver and the upgrade
ROM!
GPS Compatibility
The
latest versions of the L-NAV work with any GPS which
transmits GPRMB and GPRMC sentences of the NMEA 0183
Standard. Of course it is compatible with the Cambridge
GPS-NAV.
With no GPS connected, it functions exactly like older
versions of the L-NAV. This means that a pilot can buy
the L-NAV now and add a GPS later. The L-NAV is the
most cost effective way to move into the GPS world.
Why connect a GPS receiver to the L-NAV? First, waypoint
names and coordinates are entered by the pilot into
the GPS receiver. During the flight the GPS unit sends
data to the L-NAV including:
-
Distance to the waypoint
- Bearing
to the waypoint
- Track
of the glider over the ground
- Ground
speed of the glider
The
L-NAV subtracts the Track from the Bearing. This difference
is the Track Error and it is displayed on the L-NAV.
When Track Error is zero, the glider is headed directly
to the waypoint. Cross winds no longer make navigation
difficult!
The L-NAV measures Airspeed and Altitude, and computes
True Airspeed. The difference between True Airspeed
and Ground Speed (from the GPS) is the wind component
in the direction of flight. Wind measured at small Track
Error is entered by the pilot into the final glide calculator.
The result is a new level of precision in final glides.
Glide Computer with Graphic Glide Display
- Accurate
wind estimate using simple waypoint correction (or
by connecting a GPS).
- Rapid
update shows effect of MacCready and Wind changes.
Climb/Cruise decisions on final glide can be made
at a glance.
- Simplified
Final Glides using Graphic Glide Slope Indicator.
Set MacCready to center the indicator; then fly the
audio or Graphic speed-to-fly command.
- Digital
Altimeter Display with 5 Ft (2 meter) resolution.
Useful when you are scratching around in marginal
lift.
- Full
Function display and control available for 2-seat
sailplanes.
Well
Damped Audio Variometer with Reliable Probe type Total
Energy Compensation:
- Compensation
is independent of sailplane static location and behavior.
- Separate,
distinct, lift, speed-up, slow-down, and Slow Alarm
tones.
- Different
tone pattern for lift above and below MacCready setting.
- Configurable
steady Sink Tone in Circling Mode
- Configurable
audio quiet bands in Cruise Mode.
- Slow
Alarm tone (with optional G-Meter). Modern airfoils
need good airspeed control for optimum climb performance.
The alarm tone is based not only on airspeed, but
also on ballast, bank angle, and wing loading due
to airmass acceleration.
-
Audio over-range to 13 knots on x1 scale. There is
no need to change scale for the occasional "super"
thermal on an ordinary day.
- The
audio tone is clear and distinct, but not harsh. This
means better thermal centering with less fatigue
.Automatic
Cruise/Climb switching based on G-Meter (Option)
- Most
computers try to detect circling flight by looking
at airspeed. This doesn't work for Dolphin style flight
or circling in rough air. Instead, we combine airspeed
and acceleration inputs to detect circling. Our more
expensive approach works!
- On
standard class ships, automatic switching means reduced
mental stress for the pilot. It also means reduced
navigational errors.
- On
flapped sailplanes, there is no need for tedious or
expensive flap switch installation. Also, Dolphin
style flight with climb flap settings causes no error
in distance measurement.
Specifications:
| Size: |
3.3" (84
mm height and width, 7.7" (196 mm) depth behind
panel;
Fits Standard 3 1/8" (80 mm) instrument panel
cutout.
Choice of 3 1/8" (80 mm) or 2 1/4" (58
mm) diameter vario readout. |
| Weight: |
Computer unit:
1.5 lbs. (0.7 Kg), Vario readout: 0.6 lb (0.27 Kg) |
| Power: |
8 to 16 volts
at 0.14 to 0.18 Amps depending on audio level |
| Processor: |
80C552 with
64 Kbyte ROM, 32 Kbyte RAM, and 1 Kbyte EPROM |
| Backup
Battery: |
Lithium Coin
Cell, type BR2325 |
| Datacom: |
Industry Standard
RS-232 voltages and protocols |
| Airspeed: |
Thermistor flow
sensor; Range 0 to 170 kts (0 to 300 km/hr) |
| Variometer: |
Thermistor flow
sensor with standard external 0.45 liter flask |
| Altitude: |
Piezoresistive
Sensor; Range +26,000 Ft (8,000 meters) |
| Acceleration: |
Closed Loop
mass balance type; Range ±5g, Resolution 0.01g |
| L
NAV |
| CAF007S |
L-NAV
V5.8A System - Compatible with standard GPS and
GPS-NAV |
$2150.00 |
| CAF008S |
L-NAV
V5.8A System - Compatible with standard GPS and
GPS-NAV (With G-Meter) |
$2360.00
|
| CAF007 |
L-NAV
V5.8A (With CAA 084 Temperature Probe) |
$2,006.00
|
| CAF008 |
L-NAV
V5.8AG (With CAA 084 Temperature Probe and CAT 005
G-Meter) |
$2,237.00
|
| CAF021 |
L-NAV
57 mm Variometer Readout, Knots |
$220.00
|
| CAF022 |
L-NAV
57 mm Variometer Readout, Meters |
$220.00
|
| CAF023 |
L-NAV
80 mm Variometer Readout, Knots |
$220.00
|
| CAF024 |
L-NAV
80 mm Variometer Readout, Meters |
$220.00
|
| CAT005 |
L-NAV
G-Meter (Automatic Hold Switch and Slow Alarm) |
$231.00
|
| CAF031 |
L-NAV
Extension Speaker with Case and Mounting Bracket |
$27.00
|
| CAF032 |
L-NAV
LCD Repeater (Requires CAA 084) |
$945.00
|
| CAA084 |
L--NAV
Auxiliary PC Board for LCD Repeater (CAF 032) and
Temperature Probe (CAA 115) |
$236.00
|
| MA002 |
L-NAV
User's Guide |
$21.00
|
| XE042 |
Remote
Switch Box for XE 041 (Includes modification to
GPS-NAV Display) |
$315.00
|
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