Marina Exam Reviewer: What is provided in the highest level of commercial navigational accuracy?

Marina Exam Reviewer:

What is provided in the highest level of commercial navigational accuracy? 

A. SPS, without selective availability 
B. PPS, without selective availability 
C. DGPS, within a coverage area 
D. NAVSAT, using the Doppler-shift 



Answer:       C. DGPS, within a coverage area 


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