Thanks a lot for your answer.The exif modification is feasible than, will check the GPS API now (I met those CHDK DE pages before, but didn't know that those are (in GPS relation) the official ones.The goal is to make aerial photos from the RC plane with accurate GPS position. While the camera will be facing down, I don't expect any accurate data from internal GPS (also the altitude will be bad). So I decide to get those data from external GPS which will always face up, and use altitude from barometer. To do so, I need to have same time on all the devices.While the plane will got speed 40km/h + 15km/h wind speed = 15m/sInaccuracy of 15 meters with photo timestamp granularity of 1 second is huge deviation. So this is the reason why I am looking for milliseconds and GPS time source.Once I will write the script I will share it here.Any inputs are still more than welcome.Thanks,Ondrej.
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