Question 843Navigation General

The correct answer is A) 20-25 nm. Automatic Identification Systems (AIS) are designed to have a typical operating range of 20-25 nautical miles (nm) at sea. This range is based on the power output and antenna height of the AIS transponders, as well as the curvature of the earth and line-of-sight limitations. AIS systems use VHF radio signals to transmit and receive information, which limits their range compared to longer-range radar systems. The other options are incorrect because: B) 50-75 nm is too long for the typical AIS range, C) 6-8 nm is too short, and D) 3-4 nm is also too short for the normal operating range of AIS at sea.