What is an overdue alert?
An overdue alert is a notice sent to your chosen contacts when you have not returned or checked in by the time you planned. In hiking and search and rescue, "overdue" is the standard word for someone late back from a trip. A safety app automates that moment: instead of someone at home slowly realizing you are late, they get a message with your last known location.
Where the idea comes from
Before apps, the overdue alert was a person. You told a friend where you were going and when you would be out, and if you were not back, they raised the alarm. The National Park Service still frames it this way: leave a trip plan with a trusted contact who is not going with you, and ask them to call authorities and share the plan if you are not back on time.
The NPS advice to that trusted contact is simple: try calling the person using the number in their plan, and if you do not hear from them, contact authorities and share the trip plan details. An app does not replace that step. It makes sure the contact knows, promptly, that the step has arrived.
How an app-based overdue alert works
You set a return time before you head out. The app tracks that deadline. If you finish and check in, the alert is cancelled. If the deadline passes without a check-in, the app sends your contacts a message saying you are overdue, usually with a link to your location or your last known position.
Where the deadline is tracked matters. If it lives only on your phone, a dead battery or a crushed phone can stop the alert from ever going out. Holler tracks the return time on its server: if you have not checked in five minutes after your return time, Holler's server sends your Guardians an overdue alert by email and push, even if your phone app is closed.
The check-in timer page covers the mechanism in general. This page is about the alert itself and what the person receiving it does.
An example: you tell your sister you will be off a 12 mile hike by 4:00 and set a return time of 4:30. At 4:35 she gets an overdue alert. The link shows your route as a line up to a ridge, with the last update 90 minutes old and marked as stale. That points to a dead zone rather than a fall on the trail, but it also tells her exactly where searchers should start if you stay out of touch. Our answer on when to worry if someone is late back from hiking helps with that judgment.
What a useful overdue alert contains
An overdue alert is only the start of a response, so it should give the recipient enough to act on without a string of phone calls.
- Who is overdue and what they were doing (run, ride, hike)
- When they planned to be back
- Their last known location, and ideally the path they took
- How long ago that location was updated
- Anything they told you before leaving: route, car, trailhead, what they are wearing
Limits and false alarms
Most overdue alerts are not emergencies. People forget to check in, stop for food, or finish in a dead zone and drive out before their phone reconnects. That is normal and fine. The cost of a false alarm is a phone call; the cost of no alert when something is wrong can be hours.
The last known location may be old. With no signal, your phone cannot send new positions, so the map shows where you last had coverage. For a hiker who went into a canyon, the real position may be well past that point. The breadcrumb trail helps show direction of travel even when the final point is stale.
An overdue alert is also slow by nature. It waits for the deadline. For problems in the middle of an outing, a stationary alert can fire much sooner.
| What you see | Likely meaning | First move |
|---|---|---|
| Recent update, route heading back toward the start | Running late but moving | Call or message and give them a little time |
| Old update marked stale, in a known dead zone | No signal, status unknown | Keep calling; if still no word, call 911 with the plan and last point |
| Recent update, dot still for a long time off the route | Possibly hurt or stuck | Call now; if no answer, call 911 with the location |
| Dot back at the trailhead or home | Probably forgot to check in | Call to confirm |
What to do when you receive one
Holler never contacts 911 or emergency services itself. The Guardian who gets the overdue alert is the person who decides whether to call.
01Try to reach them
Call, then message. Many overdue alerts end here.
02Look at the map
Check the last known location, when it was updated and whether the trail shows them heading back.
03Try people near them
A partner, a friend on the same ride, the trailhead ranger station or a campground host may know more.
04Call for help if it looks wrong
If you cannot reach them and the situation worries you, call 911 or the local emergency number and share the plan and last known location. Our guide on when to call 911 if someone is overdue goes into the judgment call.
Setting a return time you will actually hit
A return time that is too tight trains your contact to ignore alerts. Estimate your finish, add a buffer for a slow section or a detour, and push the time back from your phone if you are running late. The return time calculator and the outing plan tool are good places to start. For multi-day trips, our guide on how to leave a trip plan covers what search teams want to know.
Questions people ask
How late is overdue?
Overdue simply means later than the time you planned. Your contact should judge the urgency using conditions, terrain, and how unlike you it is to be late. With Holler, the alert goes out five minutes after your return time if you have not checked in.
Do you have to wait 24 hours to report someone missing?
No. The Seattle Police Department, for one, says plainly that you do not need to wait 24 hours before reporting a missing person. If someone may be hurt or in danger outdoors, call 911, explain that they are overdue, and share their plan and last known location.
What if I'm fine but forgot to check in?
Reply to your contact right away. A quick message ends their worry. Next time, make checking in part of finishing.
Does the overdue alert work if my phone is dead?
A server-based alert does, because it does not need your phone at the deadline. Holler's overdue alert is sent from its server, even if your phone app is closed.
Keep reading
Questions people ask about this
Sources: National Park Service: Trip Plan, National Park Service: Trip Planning Guide, Seattle Police Department: Report a missing person.