Downloading a map makes streets visible without internet; it does not make yesterday’s roads safe today. A useful evacuation preparation separates static geography from live safety decisions. The map is the former. The local emergency manager, road agency and evacuation order govern the latter.
This guide owns the offline map and route evidence task. For wildfire-specific vehicle preparation, use the wildfire car departure checklist. For flood-related route choices, follow the flood alert and evacuation plan.
Decide what information must work offline
| Information | Can be stored before the event? | What still requires current verification? |
|---|---|---|
| General street map | Often through supported mapping app features | Road closures, temporary one-way changes and incident detours |
| Primary destination address | Yes, on paper and device | Whether destination remains safe and accessible |
| Alternate road corridors | Yes, on paper and saved maps | Flooded crossings, fire closures and structural damage |
| Community official hazard/zone map | Sometimes, for planning only | Current orders, boundaries and evacuation instructions |
| Family contacts and meeting point | Yes, on a private card | Whether the other person can still reach the location |
| Transit and accessible transport | Static line numbers or names may be stored | Running routes, closures, accessible pickup operations |
Ready.gov planning guidance recommends learning routes, selecting meeting places and an out-of-town contact before disasters. But those habits do not turn a downloaded route into an official evacuation clearance.
Verify the actual offline download
On a normal day, check the mapping app’s documentation for the precise offline-map feature supported on the household’s device and operating system. Select a geographic area that covers home, likely destinations and at least one separate route corridor when feasible. Save a paper copy of critical addresses without publishing private household locations.
During a safe test, temporarily disable mobile data for a short interval without disabling emergency alerts or making an emergency call, and confirm that the map and a destination name are available as expected. Restore connectivity afterward. Some apps require periodic refresh, have different downloaded regions or display only partial search/direction features offline. Document the tested capability instead of relying on a screenshot.
Never follow a stale route through danger
National Weather Service alert channels can communicate rapidly changing hazards, but a map app’s cached route may not contain these. If officials close a road or order a different evacuation direction, follow their instructions. Do not drive into moving water, smoke, active flames, debris or an area closed by responders, even if a route still looks short.
When cell service is unavailable, alternate broadcast or local instructions may be necessary. The family plan without cell service provides the contact and meetup fallback.
Offline evacuation map record
| Task | Device or paper source | Last checked | Offline limitation |
|---|---|---|---|
| Home-to-destination map coverage | |||
| Alternate safe destination | |||
| Printed contacts and accessible pickup | |||
| Live official evacuation alert method | |||
| Last successful safe offline test |
Next action: verify one saved route area and a printed contact card, then bookmark the official local evacuation source separately.
Will my navigation app reroute around a closure offline?
Do not count on it. Offline map tiles and live traffic/closure data are different services. Obey road signs and official instructions over cached directions.