Instagram's page about sharing your location on the map is detailed about who can see what, and silent about being told. There is no sentence saying the people you share with are notified when you stop, and no sentence saying they are not. Everything below is what the page does say.
The two notification sentences Instagram prints
Both are about requests, not about stopping. "You'll receive a notification when someone requests to see your locations." And: "People that've asked to see your location won't be notified when you decline their request." So declining a request is documented as quiet. Ending a share you already had is not addressed at all.
What your own screen shows
"When you view Settings in the top right of the map and see: A blue arrow: You're sharing your location with your selected audience. A red dot: You're not sharing your location. An orange triangle: You need to enable location permissions on your device to share your location." Those three states are described as what you see, not what anyone else sees.
Your pin fades on its own
"If you share your location, it will update each time you open Instagram or return to the app if it's been running in the background. Your location disappears if you haven't opened or returned to the app within 24 hours." That is Instagram describing a pin going away without anyone changing a setting, which is worth knowing before you read anything into someone else's map.
Two switches, not one
Instagram is explicit that the map setting and the phone permission are separate: "Your location sharing setting for the Instagram map is separate from your device's setting for location sharing with Instagram. For example, if you turn off location sharing to the Instagram map, location services can still be on for Instagram." It adds that "location services must be on to use this feature", so taking the phone permission away leaves the map with nothing to publish.
There is also a middle setting. "When you are inside a hidden place, no one will see you on the map", and you can hide your location from particular accounts. The step lists for all of these are on the Instagram page of this site.
Checked 2026-09-17 against: Instagram Help Centre — About sharing your location with others on the Instagram map, Instagram Help Centre — About sharing your location with others on the Instagram map (settings states), Instagram Help Centre — Turn Instagram location services on or off for your iPhone · Instagram's help page names no app version; read on its iPhone App Help tab — read 2026-09-17