Simrad RS20 User Manual page 50

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in the most recent version of Recommendation ITU-R M.1842 using
multiple 25 kHz contiguous channels.
From 1 January 2017, the frequency bands 157.150-157.175 MHz
and 161.750-161.775 MHz (corresponding to channels: 23 and 83)
are identified for utilization of the digital systems described in the
most recent version of Recommendation ITU-R M.1842 using two
25 kHz contiguous channels. From 1 January 2017, the frequencies
157.125 MHz and 161.725 MHz (corresponding to channel: 82) are
identified for the utilization of the digital systems described in the
most recent version of Recommendation ITU-R M.1842.
The frequency bands 157.025-157.175 MHz and 161.625-161.775
MHz (corresponding to channels: 80, 21, 81, 22, 82, 23 and 83) can
also be used for analogue modulation described in the most recent
version of Recommendation ITU-R M.1084 by an administration
that wishes to do so, subject to not claiming protection from other
stations in the maritime mobile service using digitally modulated
emissions and subject to coordination with affected administrations.
(WRC-15)
zx) In the United States, these channels are used for communication
between ship stations and coast stations for the purpose of public
correspondence. (WRC-15)
zz) From 1 January 2019, channels 1027, 1028, 87 and 88 are used as
single-frequency analogue channels for port operation and ship
movement. (WRC-15)
Source: ITU Radio Regulations (2016); reproduced with permission from ITU
Channel charts | RS20 operator manual