When they lay cables they calculate the lengths based on a round earth.
Who are THEY?
In what fantasy land do people register in The Flat Earth Society to ask such a question?? Methinks you would get your answer by asking THEY who lay down cables. Join the Construction Workers Association forum and ask them.
Note to honorable and clever folks:
Look at this query objectively. This is what the liar-shills need to do to keep their lies going. Their methods are neurotic.
Are you stupid or just stupid ? He asked how could these be compatible with the Flat Earth theory, buy you a BRAIN before asking those stupid-looking questions ! Neurotic methods ? I think you can't even able to define what do that mean ! And... what is YOUR method ? Excepting insulting everybody who doesn't agree with you and asking NONSENSE questions with NONSENSE logic ?
Note to honorable and clever folks:
If you want to keep your honor, ignore him.