++++ 1. Social security for migrant workers - Community rules - Matters covered - Employment relationship between worker and employer - Excluded (Council Regulation No 1408/71, Art. 4(1) ) 2. Social security for migrant workers - Applicable legislation - Mariners - Worker employed on board a vessel flying the flag of a Member State other than the one in which the undertaking remunerating him has its registered office - Legislation of the Member State in which the undertaking has its registered office and the worker is resident - Provision of the applicable national legislation making affiliation to the social security scheme and the validity of the mariner' s contract of employment subject to the condition that the vessel is flying the national flag - Application precluded (Council Regulation No 1408/71, Art. 14(2)(c) )