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Yes.
Yes. People (and vehicles) still need to know where they are going.
It sounds like you are thinking of a protractor. We still use it a lot today, especially in architecture and design. The protractor is a semi-circular measuring instrument used for measuring angles.
an expert at calculation (or at operating calculating machines)a small machine that is used for mathematical calculations
E is energy and MC2 is matter used to the second power... now you solve it