If you do not make any port, you will not need a passport to circumnavigate the globe in a sailboat. However, you will still need other documents and permits to sail legally and safely in international waters. For example, you will need a boat registration, a port clearance, a cruising permit, and possibly a radio license. You will also need to comply with the regulations and customs of the countries you sail near or through, such as reporting your position, flying the appropriate flags, and avoiding restricted areas.