Fairly Certain

• Place where there are several sets of stairs; one that matters distinguished by having thirty-nine steps.
• Full tide at 10:17 p.m. Leaving shore only possible at full tide.
• Steps not dock steps, and so place probably not harbour.
• No regular night steamer at 10:17. Means of transport must be tramp (unlikely), yacht, or fishing-boat.

Place where there are several sets of stairs; one that matters distinguished by having thirty-nine steps.

Full tide at 10:17 p.m. Leaving shore only possible at full tide.

Steps not dock steps, and so place probably not harbour.

No regular night steamer at 10:17. Means of transport must be tramp (unlikely), yacht, or fishing-boat.