Volkslogger Date Corruption

On Sat, 15 Nov 2014 11:40:35 +0200, Ian wrote:

Finally any comments. Nano vs Colibri II. Any others devices I should
look at? (I have got a while to do my window shopping, the prayer
process will still take many weeks.)

You might also consider the EW MicroRecorder - £240 + VAT + P&P.
Its a completely self-contained brick (115x85x25mm, 280g) with an
external puck-style GPS antenna and built-in pressure sensor. It has an
internal, user-swappable battery, takes a 12v external supply and has a
USB connector for configuration and downloads. Both the 12v and USB
supplies charge the battery. Uses an SD card (supplied) to store IGC
files. It is fully IGC certified.

I have one and like it.

Its biggest disadvantage is that the internal battery is NiMH and can't
be disconnected: the combo of NiMH self-discharge rate and the power
drain due to the soft power switch means that I have to remember to
charge it every month or two during the off season. During the gliding
season you never charge it: if you connect it to the glider's battery
during rigging it will be fully charged by the time you derig.

HTH


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |

On occasion when my CAI-302 hiccuped or I goofed in downloading it, I've
submitted the igc file generated by XCSoar on my Dell Streak 5. It is
acceptable to OLC, though not for badges or higher.

As to your question about acceptance of a file during an official event
even when backed by another file from a non-approved device, consider
this: You're working with a bureaucracy (contest officials). When's
the last time a bureaucrat bent the rules just for you?

Dan Marotta

On 11/15/2014 2:40 AM, Ian wrote:
On 14/11/2014 01:25, Dave Nadler wrote:
On Thursday, November 13, 2014 6:19:27 PM UTC-5, Tim Newport-Peace
wrote:
Nadler writes
A better option is replace the Volkslogger with a FLARM Core!
Far easier-to-use datalogger, and FLARM!

Depends.

FLARM is approved up to Diamonds only, but Volkslogger is approved
up to
World Records.

Assuming anybody still cares about IGC...

I do...

I am running out of badges to claim. Next will have to be 1250km
diploma or a national record. Both are rather ambitious for me in my
LS3a, so there is no hurry. But both would need a VL level security
logger. Maybe I can start preparations in the meantime by praying the
Volkslogger back to life.

In the meantime will OLC accept logs recorded by my old
(non-certified) Swiss Flarm, or a PDA running XCSoar? I still have
both of those options. (FYI you can upload a file with an invalid date
header to Skylines, but not to OLC.)

What level of contest obliges the CD to insist on a digitally signed
log file? I have not flown anything above regionals in decades. If I
were to threaten to pitch up at a nationals could I negotiate with the
CD to accept non-signed log files? (Please sir, I fly in Africa and I
promise I wont trouble the top of half of the results sheet...)

What is the validity status of a digitally signed log file that just
happens to have a date header that is exactly 1024 weeks in the past?
Especially when it is backed by other evidence, like an identical but
unsigned log file from another device which has the correct date
header. This could evolve into a big appeal process for a top level
pilot one day. Maybe I could set a precedent in the meantime.

Finally any comments. Nano vs Colibri II. Any others devices I should
look at? (I have got a while to do my window shopping, the prayer
process will still take many weeks.)


Ian

On 08/11/2014 01:04, Tim Newport-Peace wrote:
The difference in dates is EXACTLY 1024 weeks.

This would lead me to believe that possibly the RTC battery on the GPS
Engine (nothing to do with the seal) has expired and while it will get
the correct time, day of the week and week number in the 1024 week
cycle, it does not know which 1024-week epoch it is in.

This is also known to affect Colibri of a certain age.

The solution is to replace the RTC battery and prime the RTC with the
correct epoch.

In practice this may mean replacing the GPS Engine, and considering the
value of the VL, may not be economic.

In the meantime I have heard reports of another two Volksloggers and a
Cambridge of similar vintage with this problem at our club. This is a
high rate of failure in a small population and a short window period.

Somehow I don't think they all just happened to have this battery die at
the same time. More likely these batteries have been dead or dying for a
while and we have just passed some kind of Y2k date threshold which
results in the GPS board defaulting to the wrong "epoch" on the first
fix from a "cold start".

This implies there could be many more devices lurking with this problem
which will come to light when the soaring season warms up in the
northern hemisphere. If you own a logger of this vintage, I suggest you
get it out, switch it on and check what date it logs. If your date is
still good, make a point of powering the logger once in a while to keep
that battery charged!

Ian

On 24/11/2014 23:33, Tim Newport-Peace wrote:

This is probably why they are dying in droves. It is the because they
are being unused for longer periods rather than a specific date threshold.

Mine worked on the 19th October 2014 and was corrupt 2 weeks later, on
the 2nd November.

A 2nd Volkslogger in our club worked on the 10th October but was corrupt
by the 7th November.

The Cambridge worked on the 11th October but was corrupt by the 22nd
November.

(I don't have exact dates, I am just going by what my friends logged on
OLC).

Three failures in the same windows period, all with loggers that were
being used on a regular basis. I suspect there is more to this than we
realize. But I will watch this space ...

If this blows up like the Blanik issue, is there scope for the IGC to
issue special rules allowing these loggers to be used, at least for a
year or three, until pilots have a chance to get them fixed or replaced?

Ian

On 25/11/2014 00:13, Ian wrote:

Three failures in the same windows period, all with loggers that were
being used on a regular basis. I suspect there is more to this than we
realize. But I will watch this space ...

Another 7 failures reported on the "Cambridge 302 and GPS-NAV owners –
IMPORTANT NEWS" thread:

https://groups.google.com/forum/#!to...ng/3tHpsgoORxQ

Thats 10 and counting...

Ian

On 25/11/2014 00:13, Ian wrote:

Three failures in the same windows period, all with loggers that were
being used on a regular basis. I suspect there is more to this than we
realize. But I will watch this space ...

The truth emerges. This looks like it is going to effect a lot of pilots:

https://groups.google.com/forum/#!to...ng/0oGeJxn05B4

I will stop posting on this thread now and move further comments to
Richard's thread, linked above.

Ian