Spreadsheet dr.xls computes the dead reckoning (DR) position (row 11) from the previous known position (cells A3 and B3), average speed in knots (cell A7), time interval in hours (cell B7, formatted as a regular floating point number), and course (cell C7).

Summary for spreadsheet dr.xls:

Input cells: A3, B3, A7, B7, C7

Output cells: A11, B11, C11, D11, E11, F11