Offline data

Help guide · Updated June 25, 2026

What this is. Campound works fully offline once you've cached the right data. The Offline data screen is where you pre-download a state — or a whole region — before you lose signal, so trails, forest roads, public-land ownership, and basemap tiles are all readable without bars. One state is typically tens to hundreds of MB; do it on Wi-Fi before you leave home.

←The Layers menu

Open Offline data

Open the More menu (three-dot icon, top-right of the toolbar) and tap Offline data.

If any of your downloaded states have updates waiting (the catalog has been refreshed with new trail data or fresh tiles), you'll see a small yellow dot on the menu item — that's your cue to come in and refresh.

Storage usage

The line above the region grid reads Using N MB for X states — that's the total disk footprint of everything currently downloaded. The refresh icon next to it forces a re-check of the catalog for new versions.

Download a whole region

For trip planning at scale, pick a region:

Region	What's in it
West	11 states (~922 MB) — California, Oregon, Washington, Idaho, Montana, Wyoming, Colorado, Nevada, Utah, Arizona, New Mexico.
Central / Plains	11 states (~177 MB) — North Dakota down through Texas.
East	26 states (~471 MB) — everything east of the Mississippi.
Alaska	~47 MB.
Hawaii	~5 MB.

Sizes vary by region because western states have far more federal trail and forest-road data than eastern ones. Tap a region to queue every state inside it for download — the app fetches them in sequence and updates the badges as each finishes.

Or pick individual states

Below the region cards, every state is listed individually, grouped by region (WEST, CENTRAL / PLAINS, EAST, ALASKA, HAWAII). Each row shows the state name, its abbreviation, total download size, and the number of files in the bundle. The download button on the right starts the download — or shows a status pill if the state is already on disk.

Per-state list with Wyoming (not downloaded, with download button), Colorado (with green DOWNLOADED pill and blue BUNDLED pill), and New Mexico (not downloaded). — Colorado is showing both **DOWNLOADED** and **BUNDLED**. Both pills can coexist — they mean different things.

The status pills

DownloadedOn disk via Offline data — you tapped download and the app fetched the latest catalog version.

BundledShips with the app binary — the state's data was baked into the install so it works the first time you open the app for that state, even before any download.

The combination matters because Bundled data is frozen at app-release time. Downloaded data is always the latest version in the catalog. If a state shows both pills, you're running the freshest copy; if it shows only Bundled, the app catalog may have a newer version waiting (the yellow dot on the More menu hints at this).

What's actually in a download

Each per-state bundle contains:

PMTiles archives for the basemap (Street style) and the relief-shaded topo, sliced to that state's bounding box. These are what makes the map render with no signal.
Trail vector data — the National Forest trails, MVUM routes, and any other line datasets used by the overlay layers.
Land-ownership polygons — every PAD-US parcel for the state, with its agency and category attached.

Things not included: Recreation.gov campsite availability (live, needs signal), Mapbox driving directions (Mapbox API, needs signal), the Topo 3D basemap (Mapbox-hosted, needs signal — the offline-bundled topo is a different style).

Tips

Download on Wi-Fi the night before. A western state is 30–180 MB; even on LTE that's a slow chew through your data plan. Plug in, queue what you need, and let it run.

Refresh before a big trip. Trail data and ownership polygons get updated when the source datasets refresh. Open the menu, tap the refresh icon next to "Using N MB", and re-download any states with newer versions.

Web preview can't save tiles. If you're browsing campound.us on a desktop, you can look at the offline catalog but the actual download lives on the iOS app's filesystem — there's no equivalent on the web.

Bundled doesn't always mean current. The bundled state in any release is whatever was published in the catalog the day the App Store build was cut. Tapping Download fetches whatever's latest now.