タイドナビ
検潮所
Block Island
検潮所（潮汐流）
Clay Head, 1.2 miles ENE of
Great Salt Pond ent., 1 mile NW of
Great Salt Pond entrance
Lewis Pt., 1.0 mile southwest of
Lewis Pt., 1.5 miles west of
Old Harbor Pt., 0.5 mile southeast of
