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Maps files used in Memory-Map for All are not designed to be accessible to the user. We have found that too many people accidentally move or delete the maps, and they may also be attacked by malicious apps, causing Memory-Map to malfunction. The best way to install maps is to download them from the Digital Map Store (See Using Online Maps).
However, Memory-Map for All does allow you to backup your maps, so they may be re-installed later, or installed on another device (subject to the terms of the license). To make a backup copy of the current set of maps, tap the Maps button .png) then the Menu button  , Map Storage > Backup Maps To... You can then browse to the storage location where you want to save a copy of the maps.
To restore maps from a backup device, tap the Maps button then the Menu button , Map Storage > Copy Maps From... Select your device backup folder, and the maps are copied from the device into the secure internal storage managed by the app.
Note that older versions of Memory-Map allowed you to access maps directly from folders outside the app. Unfortunately, Memory-Map files have been a target for malicious activity in the past, and they are also vulnerable to accidental deletion by the user or "clean-up" utility apps. We now make a secure copy of the maps, which should prove to be much more reliable.
There are times when you may want to manually install maps. For example custom maps that you have made yourself or imported from third parties using the Memory-Map Navigator PC app. Any maps that you use with the old Memory-Map desktop mapping products can be used with Memory-Map for All. This includes Memory-Map map CDs, or any third party maps that are compatible with the desktop product. You must buy a Navigator license to use 3rd party maps or certain older Memory-Map classic maps. The software will prompt you to buy if this is needed when you open the map.
The first step is to place your maps on a device or in a folder where Memory-Map for All can access them. If the the files are larger than 4GB then a USB stick might not work. You can copy the files from a PC directly to the Files app on the device, using a cable or networking. Consult someone familiar with managing files between devices if you need help with this step.
Once you have the files on the device, tap the Maps button  then the Menu button , Map Storage and Copy Maps From...
The operating system provides the user interface allowing you to browse the folder containing the maps. Select a folder and they will be copied into the private storage area within the map. The user interface to browse the device depends on the device manufacturer and other file management apps on the device. You may be able to use a local network, or cloud storage. These facilities are provided by file management apps and Memory-Map is not responsible for what you see in the file browser app.
If you have used an old version of Memory-Map on your PC, maps may be found in the folder C:\Maps or C:\Maps_V5 on your PC hard drive.
USB Thumb drives are useful for copying data from one device to another. However, there are a number of "gotchas" that you need to be aware of.
•Some drives are formatted with the FAT32 file system. This is fine unless you want to copy large files over 4GB. Maps downloaded from the Digital Map Store are always stored in files 4GB or less, but some of your legacy maps may be much larger. In this case, use a drive with the exFAT file system.
•Before you unplug a thumb drive, you must tell the device to "Eject" or "Unmount" the drive, before you unplug it. Failing to do this will result in corrupted data.
•iOS does not provide a way to eject or unmount a drive and seems to regularly corrupt exFAT drives. We have had better luck with FAT32 drives. Even powering off the iphone seems to leave the drive in a corrupt state.
Next: How to delete a map
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