Canadian Hydrographic Service Central and Arctic Region CAEB3378 - HUDSON STRAIT SATELLITE-DERIVED POSITIONS Positions obtained from satellite navigation systems, such as GPS, are normally referredto WGS84 Datum. The differences between satellite-derived positions and positions onthis chart cannot be determined. Mariners are warned that these differences MAY BESIGNIFICANT TO NAVIGATION and are therefore advised to use alternative sources of positional information, particularly when closing the shore or navigating in the vicinity of dangers.