Date and time for a new LAST position

[RsH]

but better than what has happened would be to use the prior two date and time values to calculate the date and time based on keeping the same speed as an assumption of the speed of travel in calculating the correct date and approximate time to use for this new position.

Let me see how complex this might become...

Obviously I can do this manually. I would start out with the date and time of the last position that had a date and time and add some time to the last time, then compute the speed, and if it was too fast add seconds to the time or if too slow, remove seconds from the time to get to a reasonable speed and thus time, since the date would not be changing 99.99% of the occasions when this is done. It's just easier if the program does it .