Usually the location and reef protect Cane Garden Bay from big waves and the dinghy dock has little wave action. The only time the dinghy dock, and the whole anchorage, is potentially dangerous is during a north swell. And those are very accurately predicted on weather apps, the most commonly used one is Windguru BVI. If the waves are coming anywhere from NE to NW with more than about 1.5m with a long period then the whole anchorage should be avoided. If there's no north swell, then the dinghy dock will be accessible.