Ships and marine technology – Graphical symbols for technical documentation – Part 10: Sensors and operating indicators
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2001

Ships and marine technology – Graphical symbols for technical documentation – Part 10: Sensors and operating indicators; Text in German and English
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2012