With a depth reading, converted to tide depths, you can at least mark off several probable positions on the chart, particularly where fathom line markings exist.
Ngounzulu bokufunda obuguqulwe kukuzala nokurhoxa kobunzul ungaphawula noko iindawo ezininzi ezifaneleyo etshatini kakhulu apho umgca wefathom ophawuliweyo ukhoyo