Portsmouth Southsea Submarine Barrier

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King's Harbour Master Portsmouth

NAVWARN No 4/23

1. The Top Mark on the Starboard hand pile marking the safe channel through the Submarine Barrier has been reported as missing

2. Mariners are to navigate with extreme caution in the vicinity.

3 The following Portsmouth NAVWARNS remain in force 2/23, 1/23, 88/22, 87/22, 79/22, 72/22, 69/22, 63/22, 15/22, 71/20, 57/20,44/20, 04/20, 15/19, 60/18, 75/17, 33/17, 27/17, 57/12 and 52/11