As a result of thorough preparations, th evast majority of transports arrive safely at their destination. Sufficient safety margins in the engineering and preparations, improved waether forecasting / weather routing capabilities ensure safe transportation in most cases.
Once the voyage preparations are completed and the vessel is sailing, the master is the only responsible person for the ship and the cargo. The master needs to trust the theoretical figures given by his experts during sailing under pratical conditions. He will be guided during the transport by his own good seamanship and th elimits that are defined in the transportation manuals. On board it is virtually impossible to observe the correct wave heights. The actual roll and pitch angles can be estimated by sight and expieriance, accelerations which are the most important NOT!