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Showing content from https://developers.arcgis.com/documentation/offline-mapping-apps/partially-offline-apps/ below:

Introduction to partially offline apps | Documentation

What is a partially offline app?

A partially offline app is a type of offline app that is designed to work where network connectivity is unreliable. This is ideal for when users can access the internet but cannot guarantee constant connectivity.

There are two scenarios for using partially offline apps:

Online-first: You download maps and synchronize data in a connected environment before going offline. This strategy is well-suited for a field worker who wants to be prepared for periods of limited or no connectivity.
Offline-first: You use the app with data you already have locally and access online capabilities when connected to a network, such as using hosted layers.

When do you use partially offline apps?

You use partially offline apps when you have intermittent network access. You will mostly be disconnected, but there will be periods of connectivity during which you can download data for offline use and synchronize offline edits. You can still perform basic mapping tasks offline, as long as you have the map and data downloaded to your device. These tasks include searching for an address, making edits to offline data, performing routing, or using the device's GPU for viewshed, line-of-sight, and interactive distance measurement capabilities.

Use cases

Use partially offline apps if:

You are a mobile worker who wants to download data for fieldwork in remote areas with no network access.
You want to use online services alongside local data when the network becomes available, such as accessing weather or traffic information.
You want to synchronize field data collected offline with the online feature service or source web map upon returning to the office.

Do not use partially offline apps if:

You will never have network connectivity. Use fully offline apps instead.
Your data is too big to load over the network. Sideload it instead to your device.
You work behind a firewall for security reasons that prohibit network access. Use fully offline apps instead.

Mobile data sources for partially offline apps

The mobile data source you use depends on the capabilities you want for your partially offline app, such as editability and synchronization capabilities. You can build a partially offline app using any of these mobile data sources:

Offline maps: An offline map is a map downloaded from a web map. All the layers in the web map have to be offline-enabled before you can use the map offline.
Offline data: Offline data is data that is generated and downloaded from a data service. To support offline data, a service must be offline-enabled.
Mobile packages: A mobile package is an ArcGIS Pro project containing maps and/or scenes.
Data files: A data file is a stand-alone file containing geographic data that can be displayed by a layer in a map or scene.

The following table compares the capabilities of different mobile data sources you can use in your partially offline app:

Full support Partial support No support Topic

Learn how to build a partially offline app in How to build partially offline apps.

Online services in partially offline apps

Partially offline apps can use online services while connected to a network. For example, you can:

Use an offline map, but geocode and find routes using ArcGIS Online.
Display a web map and add a layer from a local shapefile.
Configure an offline map (or the maps or scenes in a mobile package) to include online layers. The content for these layers is not included in the offline map or mobile package. Instead, an online layer will access a data service (such as a traffic layer) whenever a network connection is available.

Tutorials

Create an offline-enabled web map

Use Map Viewer and the ArcGIS portal to create an offline-enabled web map.

Create an offline map area

Use your portal to create an offline map area from an offline-enabled web map.

Create a mobile map package

Use ArcGIS Pro to create a mobile map package.

Display an offline map on demand

Download and display an offline map for a custom area of a web map.

Display a map from a mobile map package

Access and display a map from a mobile map package for offline use.

Workflows API support Full support Partial support No support