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300 Series Products

December, 2008 - New Hardware Version
This is a new, upgraded version of the 302.  The new features include:

  • More robust flash memory, to hopefully solve or at least minimize the rare but frustrating flight log security failures.
  • USB connector on the back of the 302, to make it easy to connect to a PC.
  • Improvements to the ENL (engine noise level) hardware to solve a previous issue with the ENL recording system

Cambridge 302 Tips
Please see this article from my newsletter for some helpful tips for 302 users.

The 300 series of soaring instruments is the ultimate modular, upgradeable soaring instrument family.  It offers a multitude of features in a very small package.  Below is a quick summary of the product family:

  • 302 Direct Digital Variometer with Integral GPS and IGC Approved Flight Logger
    Direct Digital Variometer with audio and averager, Speed-to-fly director, Digital altimeter, Airspeed sensors, Outside air temperature probe, Inputs from landing gear and airbrakes provide a audible warnings for when the airbrakes are open on takeoff, and when the airbrakes are deployed while landing gear is raised, integral GPS receiver and IGC approved flight logger, provides 5 VDC output with enough current to power any Pocket PC.
  • 302A Flight Recorder - Similar to a 302 but with the vario and airspeed inputs removed.  Great flight recorder.  Works well with the 303 as well.
  • 303 Navigational Display
    When used with a 302 or 302A it offers easy-to-use navigational directions (turn arrows), final glide (302 only), wind speed and direction (302 only) tasks, pilot and polar editing,
  • 306 Vario Repeater
    Designed for use in two-seat gliders.  It displays the same information found on the connected 302.

Related Pages

Repairs and Calibrations
I (Paul Remde of Cumulus Soaring, Inc.) can replace logger backup batteries, re-seal the electronic security seal, and calibrate the logger altimeters for all Cambridge GPS-NAV and 302 products. You can see details here: Services.

Garmin GPS Failures in Cambridge Products
Cambridge soaring instruments (and most other brands) used Garmin GPS engines which seem to have a bug such that they are failing. The issue has occurred to a very high percentage of Cambridge products. If yours hasn't failed, it probably will. The great news is that Gary Kammerer (formerly of Cambridge and ClearNav) can repair or replace the built-in Garmin GPS - making the instrument fully functional again. If your Cambridge flight recorder won't record a flight log, or records flights with a date from several years ago, your logger probably needs repair. Please see the PDF file below for details on the services Gary offers.

Cambridge Repair Services by Gary Kammerer

302 Direct Digital Variometer with GPS and IGC Approved Flight Logger

The 302 DDV is the ultimate soaring instrument.  It offers a multitude of features in a very small package.  The 302 is an extremely fast and sensitive variometer with audio and averager, an altimeter, a speed-to-fly director, a GPS with integral IGC approved flight logger, and much more. 

Overview Video
If a picture is worth a thousand words, then a video with sound must be worth a million.  Below is a 13 minute overview of the Cambridge 300 Series Soaring Flight Instruments.  It allows you to see and hear all the functions of the 302.  It is a great way to see if it is the right vario for your glider.  Or, if you already own one, it is a good refresher course on how to use it.  If you find it useful then please buy from me. 

Cambridge 300 Series Flight Computer Overview
Overview Video, by Paul Remde

Cambridge 300 Series Flight Computer Overview
Duration: 12+ minutes
One of 80+ videos in the Soaring Product Training series
You can rent this video for 30 days for $3, or buy it for $10, or rent the entire Soaring Product Training series for $60 for one year.


  • Variometer with fast analog display needle
  • Speed-to-fly director
  • GPS receiver with remote antenna
  • IGC approved flight logger (100 hours @ 4 second intervals)
  • 1500 waypoints
  • Audio output for vario, speed-to-fly and alarms
  • Vario average display
  • Audible warnings for “airbrakes open” and “gear up”
  • 5 VDC output to power any Pocket PC
  • Simple user interface with a single knob - rotate/push
  • Accurate wind speed and direction using GPS and airspeed data
  • Very small package size 2.5x2.5x6” (64x64x153 mm)
  • Fits small 2.25” (57 mm) instrument hole
  • Transfer flight logs using a Pocket PC or PC

302 Dimensions
Size: 64mm x 64mm x 153mm (2.5" x 2.5" x 6")
Weight:         15.2 oz (431 g)
Supply Voltage: 12-14 VDC
Current:         300 to 360 mA, depending on audio output

Models (select model when placing order):

  • CAF 302E, DDV and Flight Recorder, Knots
  • CAF 302M, DDV and Flight Recorder, Meters
  • CAF 302E MG, DDV and Flight Recorder, Knots, with noise level recording for motorgliders, +$20
  • CAF 302M MG, DDV and Flight Recorder, Meters, with noise level recording for motorgliders, +$20

The 302 Direct Digital Variometer with GPS and Flight Recorder comes complete with the following accessories:

  • HA 435 GPS Antenna
  • CAA 114, Standard Power Cable with 10 terminal power and input screw terminal and 6 terminal input ground screw terminal
  • CAA 115, Outside Air Temperature Probe
  • CAA 116 Spare Power Cable with one 10 terminal power and input screw terminal
  • HA 349, Serial Data Cable
  • Accessory kit with:
    • TL 001 Screwdriver
    • HA 100, Three "tee" tubing connectors
    • HA 101, Three straight tubing connectors
    • 15 wire ties
  • SA 044, 1 Meter of rubber instrument tubing
  • MA 012, Laminated Operators Card
  • MA 013, User's Guide Manual
  • MA 014, 302 software CD
  • Barograph calibration certificate
  • CAF 031, Remote Speaker (for motorglider version only)

Options (select when placing order):

  • Glide Navigator II Soaring Software for Pocket PC, $149
  • CAF 303, 303 LCD Navigation Display with final glide, $410
  • CAF 306, 306 Vario Repeater for Two-Seat Gliders, $525
  • CAA 117, NIMH Reserve Battery, $95

Cambridge Aero Instruments 302 with 303 LCD Navigation Display
This system is great in regard to simplicity and ease of use.  It avoids the complexity of having a Pocket PC in the cockpit.  It is great for syndicates because data for multiple pilots can be stored and edited using the 303.  The 302 displays vario and speed-to-fly information and the 303 is used for navigation, task editing and declarations.  It also displays final glide information.  The integral GPS and logger are IGC Approved for all types of soaring accomplishments.

Example System with 302 and 303
302 303 LCD Display

Total Price: $2,835

Cambridge Aero Instruments 302 System with Naviter Oudie and SeeYou Mobile - The Ultimate 302 System
This system is fantastic.  The 302 displays vario and speed-to-fly information and the Pocket PC is used for navigation, task editing and declarations.  It also displays final glide information with reachable airports highlighted on the moving map.  The integral GPS and logger are IGC Approved for all types of soaring accomplishments. 

Example System with 302 and PDA with Soaring Flight Software
or or or
302 Goddard

Naviter Oudie
SeeYou Mobile
Oudie Cradle
Oudie Cradle Modification
(included in box with Oudie)
GNeck2-Assy-Panel or GNeck2-Assy-Side
gooseneck system,
or a RAP-B-Arm-Std-PlBase RAM arm,
or a RAM-B-SCMK-RAP-B-201-RAP-B-238
RAM suction cup mount

Total Price of all the components: $3250

302 Series Training Presentation
This presentation was created for 302 training at the SSA Convention in 2007.  It gives an overview of all the 300 series products as well as tips for each product. 
Cambridge 302 Training.pdf

Software Utilities and Firmware Upgrades
Software utilities used to upload setup data to the 302 and download flight logs from the 302 are available here: Cambridge Downloads

Manuals for all Cambridge Aero Instruments products are available here: Cambridge Downloads

300 Utility
The 300 Utility is used to download flight logs, upload waypoints and adjust 302 and 302A setup parameters.  It is available in versions for the PC and Pocket PC.  Firmware update software is also available here.  The files are available here: Cambridge Downloads.

Data Files
Cambridge Aero Instruments 302, 303 and GPS-NAV products all use the same waypoint data file format. Glide Navigator II also uses the same files.  Waypoint data files are available from John Leibacher's Worldwide Soaring Turnpoint Exchange.

Cumulus Soaring, Inc.
Paul E. Remde

8661 Connelly Place
Savage, Minnesota 55378

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