The Offline Layers Directory manages offline raster and vector layers stored in folders and/or geospatial databases on the device.

This includes the Tracking layers (for tracking locations as lines or points) as well as other layers copied to the device, or created on the device.

View/Manage Offline Layers Directory

Tap the Offline Layers Directory button on the Main Map View to see the Offline Layers Directory

Create New Empty Offline Data Store

  • Optionally, navigate to the folder in which the new data store should be created
  • Tap ‘+’ (bottom toolbar)
  • Enter the name of the new data store
  • Tap ‘New Empty Data Store’
    • The new data store will be added to the Directory

Create New Empty Folder

  • Optionally, navigate to the folder in which the new folder should be created
  • Tap ‘+’ (bottom toolbar)
  • Enter the name of the new folder
  • Tap ‘New Empty Folder’
    • The new folder will be added to the Directory

View Items within a Database or Folder

Databases can contain multiple layers and Folders can contain other folders, rasters, layers, etc.  These have a disclosure chevron to the right of their names (>) to indicate that they are containers for other items.

  • Tap an item with a disclosure chevron (>) to display its content

Add a Layer to the Map

  • Tap the add-to-map button to the right of a layer name to add that layer to the map


For a layer within a (potentially nested series of) folders and/or database, tap on the folder(s)/database items to navigate to the view showing the layers.

Raster layers are added below any other map layers that are already on the map (but above base maps).  Vector layers (point, line or polygon layers) are added above any other layers that are already on the map.

Import Data Source to the Directory from Other Devices or Other Apps

There are several ways to add existing data to Bit Map’s Offline Data Store Directory.  In many cases, you can tap on the item in the app (eg, in Mail) and use the share/action button and then, in the share panel that appears, choose ‘Bit Map’.

Another common way to add data sources to Bit Map is using the ‘Files’ App, as follows:

  • Add the data source to the ‘Files’ app (eg, copy the data source to iCloud drive, or one of the other data folder types that the ‘Files’ app supports – on the same or another device – and wait for it to sync to the Bit Map device)
  • In the ‘Files’ app, navigate to the location where the data store is (eg, to the iCloud drive section)
  • Tap the menu button (top-right button that looks like a circle with three dots)
  • Tap ‘Select’
  • Tap the data store to select it
  • Tap the folder button (bottom toolbar)
  • Select the ‘On My [iPhone|iPad]’ item to view its contents (if it is not already expanded)
  • Select the ‘Bit Map’ folder
    • Optionally select a (series of) subfolders, if desired
  • Tap ‘Copy’ (top toolbar) to copy to the selected folder

Switch back to Bit Map, and navigate back to the Offline Data Stores Directory.  The added data source should appear in the table (or in which ever subfolder it was copied to).

Unzip a Zipped Data Source

  • Tap on the .zip file

The contents of the .zip archive will be added to the offline layers directory in a new folder, named after the .zip file.

Paste Copied Item into the Directory

  • Tap the Paste button (bottom toolbar)

  • If a data source has been copied, it will be pasted to the Directory (with a number appended, if required, to avoid a duplicate name)
    • This can be used with copy to duplicate a service/source (see ‘Share or Copy’, below)

Edit Items

Rename Item

  • Tap ‘Edit’ (bottom toolbar)
  • Tap the item to be renamed
  • Enter the new name
  • Tap ‘OK’

Share or Copy an Data Store or Layer

  • Navigate to the folder containing the Data Store or Layer
  • Tap the Data Store or the Layer to view its content
  • Tap the share/action button (bottom toolbar)

  • Tap ‘Share’ to send the item to another person or device; or
  • Tap ‘Copy’ to copy the item to the pasteboard
    • This can then be pasted into the Directory using the Directory’s ‘+’ button (see above) to duplicate the item

Manage Data

Managing data includes adding layers to data sources, adding fields (attributes) to layers, and entering data into fields.

This is for more advanced users and is described on a dedicated page at:  Data Management

View or Copy Layer Metadata

A layer’s metadata includes URL, spatial reference system (authority code) and a variety of other attributes of the online service.  These values can be useful for diagnosing unexpected behaviours.

  • Navigate to the folder or Data Store that contains the layer
  • Tap ‘Edit’ (bottom toolbar)
  • Tap the ‘i’ button next to a layer
    • The metadata for that layer will be displayed
  • Optionally, press-and-hold on a metadata attribute to copy the value for that attribute to the pasteboard