The coast has no ports or harbours, only offshore anchorages. Tianjin Port has six main anchorage areas and two temporary anchorages. There are also many anchorages and marinas along the lower reaches near Fremantle. The island has many deep, ice-free bays that provide sheltered anchorages for boats. It was intersected by canals with a number of harbors and anchorages. All the while Jervis made notes on defences, harbour charts and safe anchorages. While in the Gilberts, they devoted considerable time to mapping and charting reefs and anchorages. The anchorages also contain numerous passageways and compartments. Some of the anchorages may not be ideal for sailboats under less than ideal circumstances. There are strict security regulations relating to vessels navigating near Navy facilities and anchorages. In addition, there are anchorages for private boats. They have a bow thruster for maneuvering in crowded anchorages and channels. These settlements served as market towns as well as anchorages. Essaouira has long been considered as one of the best anchorages of the Moroccan coast. Used to mark other features such as swimming areas, anchorages, pipelines.