INADEQUATELY SURVEYED. Attention is drawn to the dates of hydrographic data shown in the Source Classification Diagram.Some areas of this chart, particularly in the North East and approaches to Nunuyan Island have been compiled from sparse lead line surveys and the possible existence of uncharted shoals cannot be disregarded. Depths within these are generally shown as encircled upright figures.

PENGUKURAN KURANG SEMPURNA. Perhatian harus diberikan kepada tarikh pengukuran seperti ditunjuk dalam Gambarajah Pendarjahan Sumber. Sebahagian kawasan pada carta ini terutamanya di sebelah Timur Laut dan persekitaran kepulauan Nunuyan telah menggunakan sumber pengukuran tali perum. Berkemungkinan masih terdapat beting yang belum dicartakan. Kedalaman di kawasan tersebut ditunjukan dalam angka tegak.

