The typical operating range of automatic...

Question 1 / 2066636ee928f7522a1c51a467

Question 1 of 2066636ee928f7522a1c51a467

The typical operating range of automatic identification systems (AIS) at sea is nominally __________.

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Question 1 of 20

66636ee928f7522a1c51a467

The typical operating range of automatic identification systems (AIS) at sea is nominally __________.

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🔍 Key Concepts

• VHF radio propagation characteristics over the sea surface • Typical line-of-sight range between shipboard antennas at normal mast heights • Difference between AIS range and long-range systems like satellite AIS or radar horizon

💭 Think About

• Which answer best matches a VHF line-of-sight range between two vessels with antennas mounted on their masts? • Are any of the options more typical of satellite or HF systems rather than ship-to-ship VHF-based systems? • Which ranges seem more like harbor/port limits versus normal open-sea ship-to-ship communications?

✅ Before You Answer

• Remember AIS (Class A/B) uses VHF frequencies, so its range is similar to VHF radios under normal conditions • Think about the usual ship-to-ship VHF radio range you learn for GMDSS/ROC/ARPA studies • Exclude distances that would clearly require beyond line-of-sight or satellite relay, not just straight VHF line-of-sight

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Question 1 of 20

The typical operating range of automatic identification systems (AIS) at sea is nominally __________.

6-8 nm

50-75 nm

20-25 nm

3-4 nm

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