alleryWhich system replaced radio navigation for commercial shipping in the early 1990s?
ATelegraph
BSextant
CAstrolabe
DGPS
Answer & Solution
Correct answer: D. GPS
1. Radio navigation was the established method after World War II.
2. It was replaced by GPS in the early 1990s.
3. The sextant, astrolabe and telegraph are far older tools.
_Source: Wikipedia, Longitude, The Chronometer_
Keep practising Globe
Browse all Globe questions for CTET, or explore more Social Studies topics.
Related questions
Which treaty aims to stabilise greenhouse gas concentrations in the atmosphere?Which gas is most responsible for human-made global warming?About how long has life existed on Earth, according to the evidence?What is wilderness?Which cycle plays little part with the atmosphere because its compounds are mostly solids?Which cycle is the continuous movement of water on, above and below the Earth's surface?Which process mainly drives the oxygen cycle?What is an ecosystem?