On flying holidays we have often planned under the wing having decided where to go depending on latest weather. Choose direction, check available airports, pull out plate from Bottlang, verify fuel avalability, check notams on internet, take off, decide headings and routing as we fly. No gps on board. But being two pilots it is easy, one flying the other navigating and doing the radio.
This summer, departing Rome we intended going to the south of Sardinia. We ended up at Ampuriabrava in Spain and then in Geneva, Switzerland.
What I call Gypsy flying.