The Compass Expedition unlocks upon completing the tutorial and reaching Lighthouse Lv. 5. 

You can Summon the selected mission target from the Lighthouse and obtain rewards upon completion.

The higher your Expedition Level, the greater the chance of summoning targets with higher-grade rewards!

Selectable mission targets refresh automatically at regular intervals, and if a summoned target is not defeated within a certain time, it will be removed from the Sea Map.