Channel Marks
Channel Marks privacy policy
Last updated 14 September 2026.
Channel Marks tells you what a US buoy or beacon means and which side to pass it on. It is built to work with no signal at all, because the moment you need it is not the moment to discover you have none.
There is no account, and almost nothing to keep
You do not sign in and nothing about you is collected. There is no database of ours, no cloud sync and no backend.
What is stored, on your device
One thing: whether the app is unlocked, so it does not have to ask the App Store every time it opens.
That is genuinely the entire list. The app does not record which marks you looked up, how long you spent, where you were, or anything else. There is no name, no email address, no location and no history, and the app requests no device permissions.
Who else is involved
Apple, and nobody else. The unlock is a one-time purchase made through the App Store, so Apple handles the payment and tells the app only that the purchase exists. Apple never receives anything you entered.
There is no analytics, no crash reporting, no advertising and no tracking software of any kind. There is no language model. There is no server of ours for anything to be sent to.
The one moment anything leaves
The app has a link to the US Coast Guard's own site, because the official source should always be one tap away. Tapping it opens your browser, and what happens then is between you and the Coast Guard under their policy. The app sends nothing with you and is not told that you went.
Deleting it
There is no account to close and nothing of yours to erase. Deleting the app removes it and the one stored flag. Your purchase is held by Apple rather than by us, so reinstalling and tapping Restore brings the unlock back without paying again.
Contact
Channel Marks is published by Jeffrey L Carrier.