If you tap the label ‘Offline accessible:‘ on the top left of the map screen the map download screen will appear. If the percentage is not 100% it can happen that when you zoom in grey tiles or unsharp tiles are shown instead of the higher resolution map tiles.

However, if you zoom in, map tiles with a higher resolution will be loaded. By looking at the map screen you might think that all map tiles are already accessible, since the whole map screen is covered with tiles. In the figure above the percentage of offline accessible map tiles is 22%. On the top left of the main screen you can view the percentage of the currently visible area that is offline accessible: 22% ¶ This percentage is the number of offline accessible tiles at all zoom levels relative to the total number of all possible tiles at all zoom levels. On the top left of the main screen the percentage offline accessible map tiles of the currently visible area is shown. In Topo GPS you have to enable Menu > More > Settings > Map tiles downloading > Cellular network. If you are connected via a cellular network, downloading of map tiles can only occur if you have enabled cellular access for Topo GPS in the iOS Settings > Topo GPS. This only succeeds if you are connected to the internet. If one or more of these required tiles are not stored on your device, they will be downloaded automatically. A small number of map tiles is required to fill the map screen. The maps in Topo GPS are composed out of map tiles. Offline accessible means that the maps are stored on your device and that you can view them without a internet connection. To ensure that the maps are accessible when your are not connected to internet (offline) you can make maps offline accessible.

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