Vector Measuring Current Meter (VMCM) upgrade

The Vector Measuring Current Meter (VMCM), developed by Drs. Robert Weller and Russ Davis and commercially produced by EG&G Sealink Systems, has proven itself over many years as the instrument of choice for accurate velocity measurements in the upper ocean, especially when used on a surface mooring. The Upper Ocean Processes (UOP) group at the Woods Hole Oceanographic Institution (WHOI) is presently in the process of upgrading the existing inventory of VMCMs. This project was undertaken because the VMCM and most of its electronic components are no longer commercially available and because replacement for the Sea Data Corp., data reader and 4-track cassette reader are no longer available. The firmware control of the VMCM makes it virtually impossible to add additional sensors to the existing instruments. By upgrading the VMCM with a flexible data logger/controller, they will continue to be a viable instrument