UAV Consulting

Hi Bimbodanu,

I’m am not the author of the software. The author eventually wants to sell it. For now we’re just trying to verify usefulness and work on new features. Here’s a screenshot of the time shift utility.

  1. Open an observation file
  2. Enter time offset in milliseconds
  3. All time mark events are get time added, then re-inserted in chronological order with the satellite observations.
  4. Export > filename with time appended.

It works - but much more testing needed to verify what accuracy you can get with time shifted events.


Cool, we’ll wait your reach adaptor to the final release

180 grams with everything.

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Cheers Brian

Looking forward to testing.

That makes two of us!!

Brian, Is there any way to get a copy of this event-shifting software. Can it handle negative offsets?

I need to work a few things out with the author first.
Yes, It processes negative time. However I did not run the obs file through RTKPOST and compare geotags in Excel or Pix4D.

Hello Mr. Christal,
If you would count me in as well, I have the items you mentioned in the previous message.
Thank you in advance.

Ok, I finally had a little bit of time the past couple of days to go through the documentation I could find for RTKLIB and I understand some of it in terms or traditional surveying, but I also had an opportunity to fly the Tuffwing P4P Reach M+, generated the events.pos file and am now stuck with what to do with my images. Any help would be greatly appreciated. Merry Christmas to you all and your families!

Here are the links to Brian’s pages for doing this in RTKLib. I am going to do 2 tut videos this week. One is using EZserve do PPK the drone flights using Brian’s kit and the second will be using RTKlib. Option 1 is way easier but it can be done in both.

I have flown multiple missions now to test Brian’s (Tuffwings) kit and it working like a champ.

Here is my most recent mission that I flew with 359 images. All 359 were accounted for in the camera events (using M+). I used 1 GCP and 1 checkpoint, and I believe this was 5cm accuracy. Very sweet setup!

Here is the Pix4D report:
2018-12-22 Snowden PPK_report.pdf (1.8 MB)

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Awesome, thanks @timmyd. I have run two tests now and it captured my events as well, including the DroneDeploy preflight test shot. Since I usually takeoff from one of my GCPs it may be a good way to get that for the processing if needed. Or at least a checkpoint.
I have chatted with Stephanie, but still need to have the demo.

Hi all! I am making my first attempt at using RTKLIB to process my Reach M+ P4P and RS+ data. I am at RTKPOST now and don’t know which, or if both NAV files?


According to Emlid, you should use the rover nav file. However, especially under difficult conditions, I find it helpful to use the mgex .yyp files for this.

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Got it. I will try both and ground-truth. Thanks @wizprod.

Next thing I need help understanding is the positions tab in options. What do I do when I set my base station up on a known point? I manually entered the coordinates in base mode, but did not run corrections. Do I need the base obs at all? Or can I just manually enter it in positions? The documentation suggest Rinex Header…


Use the drop-down just over the 3 input-fields, and choose the right option.

That’s what I was assuming, but wanted to make sure. So what does the base obs do if I enter manually?

*Also, I need to enter the rod height somewhere? In antenna underneath?


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