The distance of the closing course of plat S-142 (Search Official Records - Phil Diamond - Orange County Comptroller (occompt.com)), which is 900.48', is not the sum of the individual courses. I get a sum of 786.88'. What do you get?

The Phantom 4 RTK has been the workhorse drone for thousands of surveyors across the country.  But with the FAA’s new Remote ID rules coming into effect in less than 2 months, will they even be legal to fly still?  As of right now, they still aren't compliant, but that may change in the future.

Read the blog post to get the whole story.

Good day all
I am not a surveyor but I play with GPS and specifically precision low cost units for precise positioning and navigation over dangerous terrain or for placement and remote control of machinery.
The question that I have is how is the baseline between the Base and Rover established (calculated)when RTK is in progress? Is it the horizontal distance or is it the hypotenuse?

In the above I have a Base at point A that is 10 meters away from the Rover at point B and it is also 10 meters higher. The receivers are precisely placed as indicated above.
What distance is calculated by the GPS as the Baseline?

Thank you

Sincerely

Anton