All elevations are relative to chart datum 所有标高均相对于海图基准面。
2.
Chart datum : the level to which soundings or tide heights are referenced 海图基准面：测量水深或潮水高度的基础高度。
3.
Above chart datum 海图基准面以上
4.
The tidal predictions are for victoria harbour and the tide heights are in metres above chart datum 潮汐预报是以维多利亚港为准。潮水高度为海图基准面以上高度，以米为单位。
5.
The tidal predictions are for victoria harbour and the tide heights are in metres above chart datum 潮汐预报是以维多利亚港为准。潮水高度为海图基准面以上高度，以米为单位。
6.
Water level in the tolo harbour was as high as 5 . 4 metres above chart datum as compared with the normal high tide of 2 . 2 吐露港的潮水高度竟达海图基准面以上5 . 4米，而正常的涨潮只有2 . 2米。
7.
Water level in the tolo harbour was as high as 5 . 4 metres above chart datum as compared with the normal high tide of 2 . 2 吐露港的潮水高度竟达海图基准面以上5 . 4米，而正常的涨潮只有2 . 2米。
