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#21
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GPS week rollover issue
This raises a question with me.Â* I've often heard that Cambridge started
the whole GPS flight logging thing.Â* If that is true, why did FAI come up with a different file structure?Â* If it is true, why not simply use the Cambridge file?Â* Is it not "secure" enough? On 2/10/2019 7:34 AM, kinsell wrote: On 2/9/19 9:31 AM, JS wrote: On Saturday, February 9, 2019 at 7:45:06 AM UTC-8, Tim Newport-Peace wrote: At 03:16 09 February 2019, kinsell wrote: On 2/6/19 7:57 PM, Bruce Hoult wrote: On Wednesday, February 6, 2019 at 9:00:44 AM UTC-8, Jonathan Foster wrote: I just came across this interesting page: https://www.orolia.com/resources/blo...gps-2019-week- rollover-what-you-need-know On April 6th of this year the GPS week will roll over and on some older instruments it could mess up the date. How many of our soaring instruments might have this problem? I'm guessing that will be the final end of my 1994 Cambridge Model 10. (It's already had the battery replaced, of course) I've got a 1996 era Garmin backpacker gps still holding the correct date.Â* Internal battery was replaced under warranty about 22 years ago. I'd be surprised if it suddenly got the wrong date on April 6, but really doesn't matter anyway.Â* Lots of old Volksloggers got hit with the date problem, maybe they'd be more subject to failure if any of them are still in use. Most of the Volksloggers were made with the Garmin GPS25 Engine, same as legacy Cambridge. One rollover problem the Volkslogger doesn't have is due to the robust chassis. It makes a good wheel chock. Jim At least the Volksloggers put out actual IGC files.Â* The Models 10, 20, and 25 should have been relegated to wheel chock duty long before the Volksloggers. -- Dan, 5J |
#22
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GPS week rollover issue
On Sun, 10 Feb 2019 09:32:19 -0700, Dan Marotta wrote:
This raises a question with me.Â* I've often heard that Cambridge started the whole GPS flight logging thing.Â* If that is true, why did FAI come up with a different file structure?Â* If it is true, why not simply use the Cambridge file?Â* Is it not "secure" enough? Did the Cambridge file include baro height as well as GPS? What about the task, pilot, glider and other stuff in the header, i.e. A,C and H records? FWIW, now that the use of finish rings and variable barrel size turnpoints is becoming common in some countries the IGC 'C' records (which list the start and end of a task as well as the turnpoints) really need extending to allow the logger to record the type and size of all the items that define a task, especially where variable barren sizes are used in a handicapped event. -- Martin | martin at Gregorie | gregorie dot org |
#23
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GPS week rollover issue
At 17:14 10 February 2019, Martin Gregorie wrote:
On Sun, 10 Feb 2019 09:32:19 -0700, Dan Marotta wrote: This raises a question with me.Â* I've often heard that Cambridge started the whole GPS flight logging thing.Â* If that is true, why did FAI come up with a different file structure?Â* If it is true, why not simply use the Cambridge file?Â* Is it not "secure" enough? Bob Fletcher (General Manager of Cambridge Aero Instrument) and Hans Trautenberg came up with it in 1993-4. Did the Cambridge file include baro height as well as GPS? What about the task, pilot, glider and other stuff in the header, i.e. A,C and H records? Of course. FWIW, now that the use of finish rings and variable barrel size turnpoints is becoming common in some countries the IGC 'C' records (which list the start and end of a task as well as the turnpoints) really need extending to allow the logger to record the type and size of all the items that define a task, especially where variable barren sizes are used in a handicapped event. No, not really. The C-records are for defining Tasks in accordance with The Sporting Code, which defines barrel radii and are not variable. |
#24
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GPS week rollover issue
Thanks.Â* Way more complex than needed for my flying - completed my
diamonds with camera and barograph.Â* Now I just fly for fun and use OLC/Skylines to extract the data for my logs. On 2/10/2019 10:14 AM, Martin Gregorie wrote: On Sun, 10 Feb 2019 09:32:19 -0700, Dan Marotta wrote: This raises a question with me.Â* I've often heard that Cambridge started the whole GPS flight logging thing.Â* If that is true, why did FAI come up with a different file structure?Â* If it is true, why not simply use the Cambridge file?Â* Is it not "secure" enough? Did the Cambridge file include baro height as well as GPS? What about the task, pilot, glider and other stuff in the header, i.e. A,C and H records? FWIW, now that the use of finish rings and variable barrel size turnpoints is becoming common in some countries the IGC 'C' records (which list the start and end of a task as well as the turnpoints) really need extending to allow the logger to record the type and size of all the items that define a task, especially where variable barren sizes are used in a handicapped event. -- Dan, 5J |
#25
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GPS week rollover issue
No real clue on GPS engine rollover, but I have dealt with other date issues.
Yes, I did most of my badges with a camera and a Replogle. Due to processing errors, I started doing my own film processing. I also developed other badge flights for our club until a club member (who was a pro photographer and could dump in a film load for almost nothing), sorta, "been there, done that". |
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