miles from the sea
Member
Further to a recent spate of groundings on the flats to the south of the entrance channel I was sailing in on Monday just as the sandbank near to buoy 6 was emerging ( chart drying height 1.3m) and the sandbank to the south of the low water lagoon (drying height 1.5m) was showing by about 300mm. The tide height from the Harwich gauge was 1.2m at the time which suggests that the current chart data (I was using Navionics) is not far off the mark at least for the shallowest areas of the flats. Hope this helps but as with all east coast flats they are subject the change!