Slackwater Finds the Quiet Between Tides

Why it surfaced

Slackwater computes predictions on the device from NOAA and Canadian Hydrographic Service harmonic data, rather than waiting for a signal. Its opening demonstration focuses on Deception Pass, where knowing when the water goes slack is considerably more useful than merely knowing the tide height.

An offline tidal-current calculator for boaters, with slack-water times, current speeds, direction, and week-long curves.