It represents workers on foreign ships , and has a membership of 600 .
The Tuvalu Overseas Seamen 's Union ( TOSU ) is the only registered trade union in Tuvalu .
Tuvalu Overseas Seamen 's Union represents workers on foreign ships , and has a membership of 600 .
The Tuvalu Overseas Seamen 's Union ( TOSU ) is the only registered trade union in Tuvalu .