The neutron elastic magnetic form factor GMnhas been extracted from quasielastic scattering from deuterium in the CEBAF Large Acceptance Spectrometer, CLAS . The kinematic coverage of the measurement is continuous over a broad range, extending from below 1 GeV2to nearly 5 GeV2in four-momentum transfer squared. High precision is achieved by employing a ratio technique in which most uncertainties cancel, and by a simultaneous in-situ calibration of the neutron detection efficiency, the largest correction to the data. Preliminary results are shown with statistical errors only. © 2005 Elsevier B.V. All rights reserved.