MODIFIED SURF INDEXCALCULATIONS

• MAXIMUM SURF FOR ROUTINE OPS

• TACTICAL DECISION AID

• EACH CRAFT HAS DESIGNATION

• CONSIDERS: – CRAFT DESIGN CAPABILITY – SURF ELEMENTS

• DOES NOT APPLY TO LCAC

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• The Modified Surf Index (MSI) is a unitless number which represents the total degree of difficulty of operating conventional landing craft in the prevailing or forecasted surf conditions in the surf zone of a specific beach.. Using various tables and graphs from the Joint Surf Manual the individual surf elements are factored into a formula producing the MSI.

• The MSI is a Tactical Decision Aid (TDA) that should be done by two separate agencies (for example, CATF staff and PCS) and the answers compared to ensure accuracy. This gives a Go / No Go criteria for displacement landing craft.

• The MSI does not take into consideration the state of training of personnel or the state of maintenance of equipment.