Consider the following statements regarding global positioning system (GPS) : 1. GPS cannot be used in all weather conditions. 2. In GPS surveying inter visibility between stations or points surveyed is not necessary. 3. High cost of GPS surveying has restricted the realization of the full potential of GPS. Which of the above statements are correct ?
- A1 and 2 only
- B2 and 3 onlyCorrect
- C1 and 3 only
- D1, 2 and 3
Solution
Concept
Advantages and limitations of GPS
Step-by-step solution
1. GPS works in all weather conditions, day and night (statement 1 false). 2. Inter-visibility between stations is not needed (statement 2 true). 3. The cost of equipment has limited its wider use (statement 3 true).
Explanation
GPS signals are practically unaffected by weather and need no line of sight between ground stations.
Why the other options are wrong
Statement 1 is false because GPS is an all-weather system.
Shortcut
GPS: all weather, no inter-visibility, costly.
Common mistake
Accepting statement 1.
Correct answer: B) 2 and 3 only