A method of determining the orientation of a robotic machine at a worksite contemplates providing a target on the machine, moving the target to a first position on said machine, determining the location of the first position in the worksite, moving the target to a second position on said machine, and determining location of the second position in the worksite. The blower housing generally includes an inlet, an impeller cavity, and an extension portion extending from the impeller cavity, the extension portion terminating in a circular outlet to which a round flue pipe may be attached. A jitter controller outputs a signal to the jitter generator to control a characteristic of the jitter added to the reference clock.