The most important invention in your lifetime is…
1983
GPS The Global Positioning System was opened for use by civilian aircraft
Eric Orkin launches Delphi Management Systems, the first comprehensive meetings and group sales, marketing, and catering software for the hospitality industry. It became Newmarket Software in 1985. (2023 Ball C.)

The invention of GPS was and is a life changing event for me. Fumbling with paper maps or remembering to print out my “turn-by-turn” instructions made it challenging to travel alone.
GPS, however, especially now that I can hook it up to my truck, is so convenient & safe. It helps me gauge timing, stops, locate hotels, food or just about any stop or need, on the way to my destination. Such a timesaver and stress reducer when I am alerted to accidents and delays ahead and the helpful rerouting around those delays, takes the guesswork out of these minor inconveniences.
Had to really think about this one but hands down the GPS is my pick.