After looking at the question, Why do calculations need to be made before jumping into hyperspace? I have one of my own. Is there an in-universe reason that would prevent the calculation for the jump to light speed being made ahead of time to a safe haven? For example:
I'm a smuggler, wanted by a powerful clan of gangsters for losing a shipment of theirs, let’s say the Hutts. I'm about to land on the planet of Tatooine, where the need to make a quick escape is certainly more likely than normal. I have my computer make a calculation for a jump to light speed to a know safe haven. Then I land on the planet, knowing I can flee quickly without having to wait for the computer to make any lengthy calculations in case of emergency.
Is there any reason my above scenario could not occur?