What is the frequency of VHF Channel 21A?

What is the frequency of VHF Channel 21A?

• A. 157.05 MHz
• B. 156.8 MHz
• C. 157.15 MHz
• D. 157.1 MHz

Answer: (A)

VHF maritime channels have fixed frequencies in the 156–162 MHz range, with about 50 kHz spacing between neighboring channels. The 21A designation corresponds to a specific slot in that band, which is 157.05 MHz. The A suffix identifies that variant of the channel, but the operating frequency remains 157.05 MHz. So this is the frequency you’d use for that channel. Nearby channels sit at 157.00, 157.10, and 157.15 MHz, which aligns with the surrounding options.

VHF maritime channels have fixed frequencies in the 156–162 MHz range, with about 50 kHz spacing between neighboring channels. The 21A designation corresponds to a specific slot in that band, which is 157.05 MHz. The A suffix identifies that variant of the channel, but the operating frequency remains 157.05 MHz. So this is the frequency you’d use for that channel. Nearby channels sit at 157.00, 157.10, and 157.15 MHz, which aligns with the surrounding options.