In the official SHOA Tide Tables (Tablas de Marea de la Costa de Chile), how are tidal predictions for a 'Secondary Port' (Puerto Secundario) determined relative to a 'Standard Port' (Puerto Patrón)?

1. By applying published time differences (diferencias de hora) and height differences or ratios (diferencias de altura) to the standard port's predicted high and low waters
2. By multiplying the standard port's tidal height by the vessel's deadweight tonnage
3. By adding 12 hours and 25 minutes directly to the standard port's predictions without height correction
4. By using the secondary port's atmospheric pressure reading instead of tide tables