This data record is invalid if the convolution method is used, i.e. CONV option is on, in time domain analysis. The values used in the analysis will be calculated within the program.

      2   5  7   11         21
    - --- -- ---- ---------- --------- --------- ------
   |X|   |  |DGAM|XXXXXXXXXX|         |         |      ...
    - --- -- ---- ---------- --------- --------- ------
       |  |   |                  |         |         |
       |  |   |                  |------------------------
       |  |   |                  |
       |  |   |                  |_(1)Up to 6 Added Mass
       |  |   |                       Coefficients(6E10.0)
       |  |   |
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in data categoy(A3)

(1) These 6 values specify the Drift Added Mass of the structure indicated by the Data Category Keyword, at each of the 6 degrees of freedom of motion.

Typical values of drift added mass for a ship structure in the surge, sway direction are 10 to 100 per cent of the mass of displaced water. The rotational inertia in yaw is typically the same as that of the displaced water (i.e. the same as a solid mass of the same density and shape as that of the displaced water).