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GPS-NAV Version 6.0 -- User's Guide Update

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1. Closing the switch momentarily makes a Pilot Event Mark PEV Page 3 03 22 00
2. PEV The GPS NAV LCD screen sequences through a series of messages when the ON key is pressed Pressing the GO key cancels the message sequence The GPS NAV used without an LCD screen also supports the PEV feature A pushbutton switch attached to a six conductor cable is plugged into the GPS NAV Display port Pressing the button is the same as pressing the LCD screen ON key You may fabricate the cable using one of the extra 6 conductor test cables shipped with the GPS NAV Flight Recorders Wiring instructions are included below The Cambridge Palm NAV also supports the PEV feature 2 Password activation of advanced Cambridge Palm NAV software features Palm NAV software is the intellectual property of Cambridge Aero Instruments Software development and support is expensive Because illegal copies of Palm NAV software can be made easily with a PC Cambridge has chosen to protect its intellectual property rights with passwords stored by GPS NAV starting with Version 5 5 firmware The password system is based on GPS NAV serial number This system is designed for future low cost Palm NAV upgrades via the Cambridge Aero Internet Web page Page 1 03 22 00 3 Battery power support for the Palm NAV Palm size PCs running Windows CE have reasonable battery life when used without serial data communication The Cambridge Palm NAV requires continuous serial communication with the GPS NAV Palm size PCs have very short battery life when operated
3. from GPS NAV to Palm NAV This features helps GPS problem diagnosis when Palm NAV Version 4 is used 7 Data synchronization is improved for messages between GPS NAV and Palm NAV Previous versions occasionally stopped sending messages between the GPS NAV flight recorder the GPS NAV LCD screen and the Palm NAV 8 Removes a bug that caused intermittent failure of manual fast logging When the ON key is pressed during flight a PEV mark is added to the flight log The GPS NAV flight recorder is supposed to then log 15 points at 2 second intervals Version 6 firmware fixes a bug that occasionally caused this to not happen Page 2 03 22 00 9 Removes a bug that rarely caused the arrival beep to occur outside the arrival radius Earlier versions truncated a number indicating distance to the goal point In very rare instances this caused the GPS NAV to display the Arrival message before the arrival distance was achieved The error could be up to 100 meters This computational problem has been solved Pilot Event Marker Switch for Flight Recorder without Display blu ylw grn red blk wht Bill of Materials Connector CO 040 six position RJ connector Wire WA 041 six conductor modular cable Switch Your choice This view is with the locking tab facing up The connector plugs into the Display port on the GPS Flight Recorder Connect the switch to the green grn and black blk leads The switch contacts must be normally open
4. GPS NAV Version 6 0 User s Guide Update D Ellis March 2000 This ROM Version upgrades the GPS NAV with the following features and bug fixes Items 1 4 were first introduced in GPS NAV Version 5 4 Support for the GC mandated Pilot Event Mark Password activation of GPS NAV for advanced Palm NAV software features Battery power support for the Palm NAV Minor bug fixes PO NTE Version 6 0 Improves support for Palm NAV Version 4 software Pressure altitude is sent from a non activated GPS NAV to the Palm NAV GPS Satellite data is added to messages sent from GPS NAV to Palm NAV Data synchronization is improved for messages between GPS NAV and Palm NAV Removes a bug that caused intermittent failure of manual fast logging Removes a bug that rarely caused the arrival beep to occur outside the arrival radius COON 1 The IGC mandated Pilot Event Mark All GC Approved Secure Flight Recorders are required to support a Pilot Event Mark PEV The GPS NAV does this in the following way A PEV is entered in the flight log when the GPS NAV ON key is pressed or when a TASK is started The PEV also causes a normal position fix to be logged within 2 seconds The position fix contains GPS time and pressure altitude as well as GPS position so it completely documents the PEV Fifteen fixes at 2 second intervals are logged after the ON key is pressed The GPS NAV give a short audio beep when the PEV is logged This confirms the
5. this way Therefore Cambridge GPS NAV Version 5 4 and later supplies 5 Volt power to the Palm size PC via serial datacom cable pin 8 Pin 5 is the power supply ground 4 Minor software bug fixes in Version 5 4 a Short logging interval for Navpoints more than 300 km distance If the GPS NAV is set for variable rate logging and if the active Navpoint is more than 300 km away then the GPS NAV logs at the fast interval On a very long flight logged at 6 and 2 second intervals the GPS NAV can run out of memory This problem has been solved in Version 5 4 b Leap Year bug This problem was discovered during an investigation for possible Y2K problems No Y2K problems have been found However If a flight log is being recorded at midnight UTC December 31 at the beginning or end of a leap year the flight log is divided into two parts This problem has been solved in Version 5 4 c Behavior with Westerboer 921 Glide Computer Earlier GPS NAV versions left information not required by Cambridge Aero Flight Computers out of transmitted NMEA sentences This causes problems with the Westerboer flight computer Starting with Version 5 4 the GPS NAV transmits complete NUEA GPRMB and GPRMC sentences 5 Pressure altitude is sent from a non activated GPS NAV to the Palm NAV This feature enables pilots to show differential final glide altitude when Palm NAV Version 4 is used with a non activated GPS NAV 6 GPS Satellite data is added to messages sent

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