Mark IV
Similar to Mark III. The circular scale attached to the end of the 'own ship' bar was moved to be part of the pivot assembly, so that it is fixed relative to the 'guide bar' instead of being fixed relative to the 'own ship' bar. The 'own ship' bar was redesigned with a pointer on the end to read off the scale.
Read more about this topic: Battenberg Course Indicator
Famous quotes containing the word mark:
“He was the mark and glass, copy and book,
That fashioned others.”
—William Shakespeare (1564–1616)