Raymarine RAY230E Owner's Handbook Manual page 101

Operations
Notes:
1: Transmitter is automatically disabled on Channel 15, 75 and 76 in US mode.
2: 1 Watt initially. User can override to high power by pressing and holding PTT
and the 9/1/25 key.
3: 1 Watt only.
4: Not for use by general public.
Requires special authorization from the U.S. Coast Guard, or under private land
mobile license.
5: Channel 70 is used for Digital Selective Calling (DSC) only.
Important Notice
Channel 3, 21, 23, 61, 64, 81, 82 and 83 (shaded) are not for use by the general public in
U.S. water.
These frequencies may be used only under authorization by the U.S. Coast Guard, or
under private land mobile license.
3-79