Try the following, maybe you' ll find the one for you:
/sdcard2/Android/data/com.garmin.android.apps.gmobilext/files/Garmin/
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/sdcard2/Garmin/
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/storage/sdcard2/Android/data/com.garmin.android.apps.gmobilext/files/Garmin/
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/storage/sdcard2/Garmin/
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