The subject of the invention is in particular the real-time interfacing of a plurality of mobile elements with a computing system. This simplifies the configuration for conducting both manual navigation and automatic navigation and avoids making the system larger or more complicated to install, while including boat speed regulation and stopping capability among the autopilot features. The magenta pigment ink is a light magenta pigment ink having a lightness of about 50 or more in the L*a*b* colorimetric system. The musical instrument can be a having a granite sound board that is solid granite or a laminate of granite and wood. It is possible to have a single fiber emit laser light at different frequencies due to Stokes and Anti-Stokes emissions.