UPRIGHT SOUNDINGS. Certains sounding in this chart are compiled from smaller scale chart. Mariners are advice to navigate with extra caution when in the vicinity of the area, see Source Classification Diagram.

PEMERUMAN TEGAK. Sesetengah pemeruman di carta ini disusun daripada carta berskala lebih kecil. Amaran diberi kepada pelaut supaya berwaspada semasa memanduarah di perairan berkenaan, lihat Gambarajah Pendarjahan Sumber.