Slack Water – Port Phillip
This policy explains how the Slack Water app ("the App") handles your information. Short version: the App works on your phone and has no account. It sends no personal data; only anonymous usage statistics, which you can turn off in Settings.
No account, no sign-in, no advertising, no tracking across apps or websites.
To know whether the App is useful and what to improve, it sends anonymous usage statistics: that it was opened, which screens are used (for example the map or a built-in site such as The Rip), when the subscription screen is shown and whether a purchase was started, completed or cancelled, and counts such as "a spot was added" or "a track of 120 points was saved". Each event comes with the App version, the platform (iPhone or Android) and your plan (free, Currents or Complete).
They are linked only to a random number created when the App is installed. It is not your advertising identifier, not a device identifier, and not linked to your name, your Apple or Google account, or your purchases. They never contain your location, the names or positions of your spots, your tracks or your notes.
The App sends them to our relay server (Cloudflare Workers, run by Gansoft), which removes your IP address and keeps only your country, then forwards them to Google Analytics (Google LLC) as our processor. Google never receives your IP address or device details from the App. Statistics are kept 14 months, then deleted. They are not used for advertising and not shared with anyone else.
You can turn them off at any time in Settings › Anonymous usage statistics: nothing more is sent, and events not yet sent are deleted.
Spots you add on the map, tracks you record and anything you import from a GPX file are stored on your phone only. They leave it only when you export them yourself, to the app or person you choose. Deleting the App deletes them.
The App uses your location only when you ask it to: to record a track, or to add a spot where you are. Only while the App is open on screen (it keeps the screen on while recording). Your positions are stored on your phone as part of the track and are never sent to us or to anyone else. The App does not use your location in the background. You can refuse or withdraw the permission at any time in your phone settings; everything else keeps working.
Slack alerts are scheduled on your phone. If you turn them on, the App asks for permission to show notifications. Nothing is sent to us or to a push service.
The yearly subscriptions (Currents and Complete) are sold and billed by the Apple App Store or Google Play. We never see your payment details. The App only receives confirmation that a subscription is active. You can cancel any time in your store account; refunds are handled by Apple or Google under their own policies.
In-app purchases go through Apple or Google. When the map shows background tiles from OpenStreetMap, the tile server sees your IP address, as with any online map. The App contains no advertising network and no social media SDK. Anonymous usage statistics go through our relay to Google Analytics, as described above.
With the Complete plan, the App downloads the wind, wave and storm forecast directly from the US National Oceanic and Atmospheric Administration (NOAA, nomads.ncep.noaa.gov), about every six hours while you use it. The request asks for a fixed area around Port Phillip and Western Port: it contains neither your location nor any identifier. As with any web request, NOAA's servers see your IP address. The forecast is kept on your phone so it works with no reception.
The App collects no personal data from anyone, including children: the anonymous statistics described above identify no one.
If this policy changes, the new version will be published on this page with a new date.
Gansoft — contact@gansoft.ch
Last updated: 15 October 2026