The securing arrangements for heavy project cargoes should be verified by an appropriate calculation in accordance with the principles described in Cargo Securing Manual. It is recommended to document the securing arrangement in a lashing plan containing the following information:
- Position, dimensions and MSL for suitable lashing fittings on the cargo
- MSL of lashing fittings on deck in the area of the planned stowage position onboard
- Number and MSL of lashings to be used
- Sketch showing the lashing arrangements with allowed vertical and horizontal lashing angles for the different lashings
- Information on safety factor for the proposed arrangement