Quick answer
Players obtain nautical charts to locate remote islands. Those islands support treasure hunting and contain rare animals not found on the mainland.
Confirmed facts
- Nautical charts reveal island locations.
- Remote islands contain treasure.
- Some rare animals are island-exclusive.
What this means for players
This answer uses confirmed publisher information. Exact routes, values and unlock requirements will be added only when official details or verified gameplay can support them.
Still to verify
- Launch-day gameplay verification
- Exact requirements, values or coordinates
- Any platform or version differences
Source policy
Checked July 18, 2026 against Natsume’s official March 11 title announcement and June 18 gameplay-feature announcement. Unknown routes, values and entity names are excluded instead of inferred from earlier games.