When does it go slack at the Rip, Pope's Eye, San Remo or your favourite mark? Port Phillip and Western Port. Know before you leave the ramp — and on the water, even with no reception. Now with 48-hour wind, waves and storm risk.
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Through the Heads the tide runs at four knots and more, and the slack that lets you dive Pope's Eye or Lonsdale Wall lasts minutes, not hours. It turns at a different time at every site, and the run-in and run-out don't behave the same. Slack Water works it out site by site.
The tidal current at the moment you opened this page, computed in your browser from the same model as the app. Tap the water to read speed and direction; drag the timeline to see the next hours.
The Rip, Lonsdale Wall, Pope's Eye, Portsea Hole, Portsea, Queenscliff, Blairgowrie and Rye piers. The turn, and the window when the current stays under your own limit.
See where it's running and where it's slack. Arrows, a colour map by speed, or animated flow. Slide through the next three days.
Wind and gusts on the map and at every site. Waves in both bays and at the Rip, worked out on your phone from the wind, the fetch, the depth, the tide and the current — wind against the ebb at the Heads shows up as a short, steep sea. Storm risk from the atmosphere's instability. Checked against the five wave buoys in Port Phillip.
Get a heads-up before slack at the sites you pick, and when 10 knots of wind or more will blow against the current. You choose how early.
Drop your marks on the map, or open a GPX file from your plotter and pick the ones you want. Current and slack at each one. Record your track on the water and export it as GPX.
Depth shading and contours every 5 m — 2 m in the Heads and the Western Port entrance — with the depth written on the line. Drying banks are drawn in green, so you can see the ground that uncovers. Turn on the seabed and you get sand, mud, seagrass and reef. Every layer switches on and off.
Everything is calculated on your phone. No account, no data plan needed on the water.
Times are shown in Melbourne time, daylight saving included, wherever your phone thinks it is.
