At 02:38 26 May 2019, kinsell wrote:
On 5/25/19 6:58 PM, Dan Marotta wrote:
I turned on my CN2 and CNvXC 20 minutes before engine start today. Then

it was another 15 minutes to warm up the engine before take off.Â* Even

though I had several GPS drop outs during the flight, it scored
perfectly.Â* BTW, all other devices in the cockpit, including my buddy's

iPad also lost GPS for those times.Â* Looks like the work around is to
let the GPSs get time synchronized before take off.

Basically, the Time in the IGC file originates in the GPS Engine. At
power-up it comes from the RTC, but once 'Satellite Time' has been received
and the correct number of Leap Seconds applied, the source switches to
that.

The difference can be in the order of 2 seconds, and this causes the
out-of-sequence times that OLC seems objects to.

There are two workarounds and you can use either or both.

1. Set the logging interval to 4 seconds or more, which will conceal the
2-second jump.

2. As you said, Switch on well in advance. 15 minutes is about right IMHO.
10 minutes is the time it takes to be assured that the time is correct, and
5 more to be sure that the FR has not back-logged the jump.