Sailing calculators
Each calculator here runs the formula CapMate uses on board, with the same limits and the same rounding. Nothing to install, nothing to sign up for.
Anchor chain length calculatorWork out how much anchor chain to let out tonight, counting the rise to high water and the gust forecast. It uses the same formulas CapMate runs on board.
True wind from apparent wind calculatorWork out true wind speed and angle from apparent wind and boat speed, using the same vector formula CapMate runs on your plotter feed and on the watch.CapMate
Let CapMate keep the watch
The same formulas run on board: CapMate picks the chain for tonight’s forecast, watches the anchor all night and wakes you on your wrist if it drags.
