The basic concept of a rocket goes back to 400BC and Archytas, who built a wooden bird propelled along wires by steam.
The basic concept of the modern jet engine was patented as a stationary turbine in 1791 working versions were built in the 1800s. Turning it into an aircraft engine was just a matter of making it smaller and lighter.
Charles Babbage came up with the concept of the Analytical Engine in 1800s, even though he couldn't build it at the time.
The idea of sending messages through a network of wiring comes from the telegraph, which showed up in the 1750s.
GPS navigation is a combination of a lot of technologies; rocketry (already mentioned), radio (Marconi in the late 1800s), navigation by triangulation (celestial navigation, the whole of written history), atomic clocks (Lord Kelvin, 1800s) and so on.
Modern day technology didn't suddenly pop into being during WWI. but rather is an evolution of older, pre-1914 technology and most of those older technologies weren't actually developed as tools of war. The human race just happens to be very good at taking any technology available and using it to kill one another.
tl;dr - don't dis pre-1914 tech. Without it, we'd all be sitting in caves drawing crappy pictures on the walls for entertainment.