Rose, compass and butterflies design

His daughter Ada, who was nine and had no patience for grown men's excuses, took the compass from his desk one wet morning and carried it down to the shingle. She sat on an upturned crab pot, turned the case slowly until the needle held still, and counted her paces from the church tower to the rock where the gulls gathered, scratching each number in the sand with a stick. Her father watched from the doorway with his pipe gone cold. Her figures were nothing like his.

When he checked her sums that night, they were right, and he was ashamed of how long it took him to say so. She had walked the coast with the cracked glass and found the error was his, not the brass. He had been measuring from the old timber tower, which the charts still showed, when the storm had long since taken it and the stone one stood in its place. Ada had simply trusted the ground. He sat with the pencil she had left on the table and drew a rose around the points of the compass, its petals shaded fine as hatching, with two butterflies at the edge, because she had asked him for something pretty to go on the sheet.

The Admiralty sent the chart back without a red mark. Ada kept the first, cracked-glass sheet folded in her coat pocket, and when she was grown and took over the chart-house, she kept the rose in the corner of every page. Visitors asked why a navigator's office needed flowers. She only tapped the needle and waited for it to settle.