The Collaborative International Dictionary of English v.0.48:

Sprayboard \Spray"board`\ (spr[=a]"b[=o]rd`), n.
   1. (Naut.) See Dashboard, n., 2
      (b) .
          [1913 Webster]

   2. (Naut.) A screen raised above any part of the gunwale of a
      boat to keep out spray.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Dashboard \Dash"board`\ (d[a^]sh"b[=o]rd`), n.
   1. A board placed on the fore part of a carriage, sleigh, or
      other vehicle, to intercept water, mud, or snow, thrown up
      by the heels of the horses; -- in England commonly called
      splashboard.
      [1913 Webster]

   2. (Naut.)
      (a) The float of a paddle wheel.
      (b) A screen at the bow af a steam launch to keep off the
          spray; -- called also sprayboard.
          [1913 Webster]

   3. an instrument panel beneath the front window of a motor
      vehicle (such as an automobile or truck), containing
      indicating gauges and dials, such as the speedometer and
      fuel gauges, and sometimes certain control knobs or other
      devices.
      [PJC]