SATELLITE-DERIVED POSITIONS
Positions obtained from satellite navigation systems, such as the GPS, are normally referred to WGS84 Datum.  Such positions can be plotted directly on this chart.

NAVIGATIONAL AIDS
The navigational aids in this area have been compiled from the survey report. Hence mariners are advised to refer latest publications and consult local agencies for guidance.

TIDAL LEVELS
The water level in the stations are strongly influenced by meteorological and seasonal factors, the changes caused by these effects can change the water level +/-40 cm.

CORAL REEFS
Area of living reef with a pronounced micromorphology mainly made up by the colonies of coral exists till 200 metres of depth. Hence mariners are advised to contact local agencies for designated areas and are advised to navigate with caution.