What two instruments made navigation much easier in the 1900s?

Question by bloodyheartb5: What two instruments made navigation much easier in the 1900s?
A. Global Positioning Satellite (GPS) and two-way radio
B. The chronometer and the astrolab
C. The cross-staff and the compass.
D. The chronometer and the compass.


Best answer:
Answer by nacsezGPS wasnt invented til the 1990s
The compas was around for centuries before 1900.

the only answer left is B, even though i have no idea what an astrolab is

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