Tide Calculation for Secondary Port Dungeness The height of a Lt. Ho. at Dungeness (ATT Vol.1, 87) is charted as 40m. What height would you use when taking a vertical sextant angle at 1800 GMT on June 8th? Tide Calculation for Secondary Port Dungeness Since the range is not same as spring or neap, interpolation … Continue reading Tide Calculation for Secondary Port Dungeness