Quality Marine Services was the sales and service agent for C.Plath Navigation during the mid-nineties. 
After several M&A, C.Plath Navigation has been fully absorbed into the Northrop Grumman Group and is now part of Sperry Marine. QMS remains as a dealer for the range of marine navigation equipment and carries out servicing on them regularly.
Autopilot, Gyro Compass, Magnetic Compass, Electromagnetic Speedlog,