ASTRO XTS 2500/XTS 2500I Model III 121
Appendix: Maritime Radio Use in the VHF Frequency Range
Non-Commercial Call Channel
For non-commercial transmissions, such as fishing reports, 
rendezvous arrangements, repair scheduling, or berthing 
information, use VHF Channel 9. 
Operating Frequency Requirements
A radio designated for shipboard use must comply with Federal 
Communications Commission Rule Part 80 as follows:
• on ships subject to Part II of Title III of the Communications Act, 
the radio must be capable of operating on the 156.800 MHz 
frequency.
• on ships subject to the Safety Convention, the radio must be 
capable of operating:
• in the simplex mode on the ship station transmitting 
frequencies specified in the 156.025–157.425 MHz frequency 
band, and
• in the semiduplex mode on the two frequency channels 
specified in the table below.
Note: Simplex channels 3, 21, 23, 61, 64, 81, 82, and 83 cannot be 
lawfully used by the general public in US waters.
Additional information about operating requirements in the Maritime 
Services can be obtained from the full text of FCC Rule Part 80 and 
from the US Coast Guard.
Table A-1: VHF Marine Channel List 
Channel 
Number
Frequency (MHz)
Transmit Receive
1 156.050 160.650
2 156.100 160.700
* 156.150 160.750
4 156.200 160.800
5 156.250 160.850
6 156.300 –
7 156.350 160.950
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