| x1 | 156.375 | Channel 67 Coastguard |
| x2 | 156.425 | Channel 68 Crayfordness to No 4 Buoy (Southend area) |
| x3 | 156.475 | Channel 69 No 4 Buoy (Southend area) to Seaward Limit |
| x4 | 156.700 | Channel 14 Teddington Lock to Crayfordness |
| x5 | 156.725 | Channel 74 Medway Ports |
| x6 | 156.800 | Channel 16 Calling Frequency |
| x7 | 156.900 | Channel 18 (Ship) Port Control Centre Secondary |
| x8 | 157.000 | Channel 20 (Ship) Port Control Centre |
| x9 | 157.100 | Channel 22 (Ship) Thames Barrier Navigation Centre Secondary |
| y0 | 161.500 | Channel 18 (Coast) Port Control Centre Secondary |
| y1 | 161.600 | Channel 20 (Coast) Port Control Centre Secondary |
| y2 | 161.700 | Channel 22 (Coast) Thames Barrier Navigation Centre Secondary |