:orphan:

.. _COGO Command\: BIAS:

COGO Command: BIAS
----------------------

This version of Steel BRIDG requires that the truck path be at Y=0. 
Some older BDF files that were translated from the older 3D program use a Y coordinate that is not 0.
So that all the data need not be re-entered and re-calculated, 
a bias can be applied to the input data. 

Command is:

.. list-table::
    :widths: 25 25 25 25
    :header-rows: 1
   
    * - Command
      - X-bias
      - Y-bias
      - Z-bias ()
    * - BIAS
      - 0
      - 39.85
      - 0


In the following example if this bridge, 305-10, which was converted from an older version of BRIDG,
does not use the bias command, and has set the truck (stringers) at Y=39.85 feet, the program gets 
very confused and will not calculate the truck path correctly.

.. figure:: ../../Graphics/305-10_nobias.png
    :alt: 305-10_nobias.png

Adding the BIAS command:

.. figure:: ../../Graphics/305-10_cogo_bias.png
    :alt: 305-10_cogo_bias.png


.. figure:: ../../Graphics/305-10_withbias.png
    :alt: 305-10_withbias.png