The 6-GHz methanol multibeam maser catalogue IV: Galactic longitudes 186◦ to 330◦ including the Orion–Monoceros region

We present the fourth portion of a Galactic Plane survey of methanol masers at 6668MHz, spanning the longitude range 186◦ to 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%. 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 MERLIN array.