||Several Hydrographic Offices, in consultation with their Ministries of Transport, have added recommended directions in areas such as the outer approaches to major ports in order to show the best routes for crossing traffic or to minimize head-on encounters.(IHO Chart Specifications, M-4). The object 'recommended traffic lane part' indicates the recommended traffic flow e.g., between two TSS, in the entrance areas of a TSS, beside a deep water route. The complete recommended traffic lane consists of one or more parts depending on the various shapes of the recommended traffic lane. The orientation of the recommended traffic lane part is defined by the middle-line of the recommended traffic lane part relating to the general direction of the recommended traffic lane part.