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Present Frequency bands used by Ship radiotelegraph stations for calling, working and distress traffic are:

Low Frequency : 90-160 kHz
Calling Frequency: 143 KHz (Mode A1 only)
152-158 KHz
Medium Frequency: 405-535 kHz
Radio Direction Finding (RDF) 410 kHz
Calling: 425, 444, 454, 468, 480 kHz
Calling & Distress 500 kHz
Calling when 500 occupied 512 kHz by distress

High Frequency: 4-25 MHz
Calling, all ships in kHz

4180.2-4187.0 (in 0.4 kHz steps)
6270.3-6280.5 (in 0.6 kHz steps)
8360.4-8374.0 (in 0.8 kHz steps)
8364.0 (for safety of life only)
12540.6-12561.0 (in 1.2 kHz steps)
16720.8-16748.0 (in 1.6 kHz steps)
22228.0-22246.0 (in 2 kHz steps)
25071.0-25075.0 (in 2 kHz steps)
Working, high-traffic ships, in kHz:
4172.5-4176.0
6258.75-6264
8342.0-8355.0
12505.5-12532.5
16662.0-16710.0
22189.0-22217.0
Working, low-traffic ships, in kHz:
4188.5-4219.0
6282.7-6324.7
8377-8359.5
12565.5-12529.5
16754.0-16718.5
22250.5-22261.0
25091.0-25104.5

Frequency bands in which coastal stations communicating with ship radiotelegraph stations will be assigned:

90-160 kHz band: 112.85-153 kHz
415-525 kHz band: 416-512 kHz
4-23 MHz band:

4238.0-4316.0 kHz
6351.0-6512.5 kHz
8502.0-8726.0 kHz
12745.5-13119.0 kHz
16933.2-17242.4 kHz
22407.0-22617.0 kHz
Radiotelephone Frequencies:
The 2-23 MHz or HF bands in which ship radiotelephone stations may be assigned for calling, working and distress traffic are:

1619.0-2830.0 kHz (A3A, A3H, A3J)
2182.0 kHz (International Distress Frequency)
4069.2-4434.9 kHz SSB
5680 kHz SSB
6147.5-6512.9 kHz SSB
8201.2-8780.0 kHz SSB
12358.0-12435.4 kHz SSB
16474.0-16593.3 kHz SSB
The 2-23 MHz or HF bands in which coastal stations may be assigned to communicate by SSB with ships are:
2009.0-2782.0 kHz
4071.0-4371.0 kHz
6147.5-6455.0 kHz
8207.0-8783.2 kHz
12379.0-13158.0 kHz
16488.0-17283 kHz
The 156-162 MHz or VHF band is divided into 25 kHz channels in which narrowband F3 emissions are used. Some representative channels are listed below:

Channel  Frequency for ship/Coastal station Type of message
16 156.8 MHz Distress, Safety, Calling
6 156.3 MHz Intership Safety
7 156.35 MHz Commercial
9 156.45 MHz Noncommercial
12 156.6 MHz Port operations
13 156.65 MHz Navigation (continuous Listening
watchwhen vessels are in
heavy-traffic area)
15 156.75 MHz (Coastal) Environmental
24 157.2 MHz(ship)161.8 MHz(Coast) Public correspondence
68 156.425 MHz Yachts
162.55 & 162.4 MHz (Coastal) Weather Broadcasts