Loading New Destination into GPS?

ok....I have tried to figure this out but cannot so i am asking....
I save my flight after I land and park...at a later time I open the saved flight and I am at the same spot as I should be....but then how do I load a new destination in the GPS without going through flight planner? If I got through flight planner then I have to choose a starting point (like a gate or active runway) and its never exactly where I was when I saved the flight....
Thanks guys!
I save my flight after I land and park...at a later time I open the saved flight and I am at the same spot as I should be....but then how do I load a new destination in the GPS without going through flight planner? If I got through flight planner then I have to choose a starting point (like a gate or active runway) and its never exactly where I was when I saved the flight....
Thanks guys!