We present the fourth portion of a Galactic plane survey of methanol masers at 6668MHz, spanning the longitude range 186°-330°. We report 207 maser detections, 89 new to the survey. This completes the southern sky part of the methanol multibeam survey and includes a large proportion of new sources, 43 per cent. We also include results from blind observations of the Orion-Monoceros star-forming region, formally outside the latitude range of the methanol multibeam survey; only the four previously known methanol emitting sites were detected, of which we present new positions and spectra for masers at Orion A (south) and Orion B, obtained with the Multi-Element Radio Linked Interferometer Network (MERLIN) array. © 2012 CSIRO. Monthly Notices of the Royal Astronomical Society © 2012 RAS.
- Stars: formation