Where is the navigation orb?
In the hut next to the lighthouse, there is a secret room on the second floor with the navigation orb
inside. You open it on the attic with a switch located near a
crack in the floor.
Where can I find the key to storage room # 5?
In a basement in one of the pirates huts... under water.
In one of the up stairs rooms before you get into the
light house there is a room with 4 water arrows and
a broken chair. There seems to be a secret door in
the room also; how do you open it?
You're right, there is a secret room there with the "navigation orb" (?) inside.
You open it on the attic with a switch located near a crack in the floor.
I really can't find the key to storage room #5. Which pirate hut are you referring to?
The key to storage room #5 is in the sub-aquatic station #1. This station has a room
with a lever that opens the entrance to this station. Look there for a hole in the floor
where you can access the basement. In the basement, you will encounter several rooms
where the water is a few feet high; in the last room, the key lies on the floor. (under water!)
The key is of orange-golden colour, so you can't miss it.