Android "App shortcuts" for Locus Map (Android 7.1.1)
Android 7.1.1 introduced "app shortcuts". If you long-press an app icon, it displays a list of shortcuts (actions). Here's an example of long-pressing the Calendar app.
You can optionally drag an "app shortcut" onto the desktop to create an icon. Tapping the icon will launch the action directly.
I suggest Locus Map support "app shortcuts" for Presets. Here's an example of what I mean:
It will let you conveniently start Locus Map configured for the preferred activity.