oceanfroggie
Well-known member
With 15 minutes until low water we heard a Mayday called just outside Portsmouth harbour. . . .
I was thought:
Mayday = Grave AND Imminent danger
Pan-Pan = Grave OR Imminent danger
With only 15 mins left before LW, softly around in benign sea state, she is hardly listing, so doesn't seem a mayday, but probably a pan-pan, although neither 'grave' nor 'Imminent' seemed to apply looking at the photo above. However two risks come to mind, passing wake bouncing her, and there may have been the risk of water ingress after she floated off had the keel struck a hard object on the sea bed as she ran aground.
If in doubt Pan-Pan would have seemed a sensible call in this case, unless they were unsure of the time of LW and therefore concerned she could have rolled well over.