Out of sight of land they used astral navigation. The got as far afield as the Canary Islands and Cornwall.
Astral navigation; an alphabet.
their alphabet
Their alphabet and astral navigation.
An alphabet; astral navigation.
Astral navigation, alphabetic writing.
An alphabet, astral navigation.
Their alphabet and astral navigation.
Trade, an alphabet and astral navigation.
Their alphabet and astral navigation.
Trade, astral navigation, fighting, inventing an alphabet.
They gave us alphabetic writing and astral navigation.
Their trading empire and their innovations -an alphabet and astral navigation.