If there is additional information available, just tap the icon in the map to get a detailed description in a popup.
The shown icons on the map can be filtered e.g. for their type, location and status.
To backup your data or share it with multiple devices you can use the iCloud sync.
Disclaimer: Tears Companion is a third party App. The developer of this software is not affiliated with Nintendo Co. Ltd. in any way. However, the creation and maintenance is permitted until withdrawal from Nintendo.