Snapchat's help pages describe Snap Map in terms of visibility, not alerts. Across the Ghost Mode page, the page on sharing with select friends and the page on how long a location lasts, there is no sentence saying a friend is notified when you stop sharing — and no sentence saying they are not. That absence is the accurate answer, and the rest of this page is what Snapchat does document.
What Ghost Mode does, in Snapchat's words
"When you enable Ghost Mode, your location will still be shared with Snap, but it won't be visible to anyone else on the Map." Two halves, and the second half is the one people miss: Ghost Mode hides you from friends, not from Snap.
There is also something friends can see. "When you're in Ghost Mode, your Bitmoji will hold up a blue sign with a ghost icon, unless you are sharing your live location." That is not a notification pushed to their phone, but it is a visible state on the Map if they look you up.
Ghost Mode is timed. Snapchat's steps end with: "Select a timer for how long you want to stay in Ghost Mode (3 hours, 24 hours, or Until Turned Off)." Pick one of the first two and you come back out on your own.
Choosing who can see you
Snapchat's page on sharing with only some friends is where the one notification sentence lives: "Friends you select aren't notified when you choose them." It is about picking an audience, not about switching sharing off, so it does not answer the Ghost Mode question — but it is the closest Snapchat comes to addressing notification at all.
Your last position does not vanish instantly
Snapchat: "That depends on your device settings. For example, if your device's location permission is set to 'Always,' it will stay on Snap Map until you turn it off or it expires. If your permissions are set to 'Only while using,' your location on the map will expire after 24 hours." So after you take the app's permission away in your phone's settings, what friends saw last can sit on the Map until it expires.
The step lists for Ghost Mode, for choosing an audience, and for the phone permission are on the Snapchat page of this site.
Checked 2026-09-17 against: Snapchat Support — How do I turn on Ghost Mode?, Snapchat Support — How do I share my location with only select friends on Snapchat?, Snapchat Support — How long does my location stay on Snap Map? · Snapchat's help pages name no app or OS version — read 2026-09-17