A vessel with a maximum draft of 2.2 meters plans to cross a rocky coastal bar with a charted depth (sonda de la carta) of 1.5 meters. The skipper requires a minimum safety under-keel clearance (resguardo bajo la quilla) of 0.8 meters. What is the minimum Height of Tide (Altura de marea) required to cross safely?

1. 1.5 meters
2. 0.7 meters
3. 3.0 meters
4. 2.2 meters