Sailor's used to use a compass and a map.
light house or gps
they do because they know which constellations go north, south, west, and east Also, they would get lost without constellations.
It uses "sonar" technology where it can detect obstacles in front.
not very close
Gravity is everywhere in the universe. There's no getting away from it, anywhere.
Cook famously circumnavigated the World without losing a single man from Scurvy.
Cause without byoyancy, some sailors wouldn't be sailors anymore.
a compass
Yes, without it we would probably be much more advanced than we are now.
build technology
with the help of star
Since humans cannot survive without technology (nor could many of our prehuman ancestors) it will obviously be popular. Consider what you would do with no clothing, no means of getting/preparing food, etc. All of these are technologies!
Sinkholes could be prevented, but not without huge expenditures of money.
For trade and warfare in an age without mechanical transport.
It is called digital Divide. This is the gap created between people used to technology and those without technology.
Because the physics optimistic the technology without physics there can be technology.
Most find it more convenient but without getting to know people. like any technology, it's a trade off.