Question 1 of 27070
Q
Describing VHF transmissions as "line of sight" does NOT mean:
A
VHF communications are effective only with nearby stations within visual range of the bridge .
B
Vessel antenna height will not affect the radius of propagation.
C
The normal transmission range to a coast station is approximately is 10 NM.
D
Coast station antenna height has no effect on the radius of transmission.
Question 1 / 270701RQEcJubM8f8B6gF9v4w
Question 1 of 270701RQEcJubM8f8B6gF9v4w

Describing VHF transmissions as "line of sight" does NOT mean:

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Question 1 of 27070
Q

Describing VHF transmissions as "line of sight" does NOT mean:

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🔍 Key Concepts

• VHF (Very High Frequency) radio waves travel primarily in straight lines and are often called line-of-sight • The height of the transmitting and receiving antennas affects how far line-of-sight signals can go over the horizon • Typical VHF range between ships and between ship and shore under normal conditions

💭 Think About

• Which choices describe something that is actually true about line-of-sight VHF propagation, and which describe something that is clearly not true? • Think about how raising an antenna higher up (on a mast or a tall shore tower) would realistically affect how far you can communicate. • Consider whether "within visual range of the bridge" is always the same as the true radio horizon distance for VHF.

✅ Before You Answer

• Identify which options involve antenna height and consider whether height logically changes radio range for line-of-sight signals. • Compare the stated 10 NM range to what you know is a typical order-of-magnitude for ship-to-ship or ship-to-shore VHF range. • Decide which statement is most clearly incorrect about how line-of-sight VHF actually behaves, rather than just being approximate or conservative.