On Monday, June 25, 2012 3:21:51 PM UTC-5, jjbird wrote:
On Monday, June 25, 2012 11:15:01 AM UTC-4, Tony wrote:
On a few recent flights I have had some issues with my Nano "freezing up" in flight. I have a Nano connected to my Oudie with the Socket mobile power pack and a goddard cable. Usually it has worked flawlessly with no issues noted. Last two flights at some point the Oudie moving map display "freezes" such that the little glider doesn't move anymore. Oddly enough it seems that the nav boxes continue to update with required L/D data etc. After a few minutes everything starts working again. During this time on my flight yesterday I pulled the Nano out of my side pocket and all 3 lights were blinking, indicating a good GPS location and that it was logging.

However when I look at the trace post flight there is a period of ~2 minutes where no position was logged. Here is the flight yesterday: http://www.onlinecontest.org/olc-2.0...l?dsId=2513934

Check out the area from the 2nd half of my 2nd thermal on course to the beginning of my 3rd thermal on course. the trace seems to get coarse during the 2nd climb and then has a big jump before starting the 3rd climb.

I will note that I noticed this time that the "low battery" light on the socket mobile power pack was blinking, which is strange because it was supposedly fully charged 2 nights before the flight with no use in between. There was no warning given on the Oudie that external power had been lost or that it had switched to the internal GPS, which would happen if external power was lost.

and here is another flight where the same issue occurred:
http://www.onlinecontest.org/olc-2.0...l?dsId=2340248

You can see on the OLC barogram where the ground elevation is not shown where the logging issues popped up.

Anyone seen similar issues or have any ideas?

Maybe it's all the carbon fibre in your glider interfering with the gps?

Did the Oudie freeze and Nano dropout happen at the same time (perhaps try running the Oudie off of its internal GPS and see if the problem recurs)?

John, I'm pretty sure that the "freeze" on the Oudie corresponded with the wide gaps in no data logged on the Nano. I will check the log that the Oudie made tonight and see if it is the same. I'm not sure if the Oudie logs the external data when it is connected to an external GPS or if it logs its own GPS data.

There is another possibility...both of the flights had their "dead spots" as I was in the vicinity of state highways, K-96 yesterday and K-14 on the flight in May. Perhaps I just got lucky and a semi was travelling by me with a GPS jammer??? I think Steve suspected something like that last year down south. Anyone know what the range is on such devices?

I've had other flights with the same exact hardware setup this year, using the same locations in the same glider, with no issue.