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Chip/Capt,Both of you refer to sensors in an engine, but I wonder if it might be best to think of transmiters in the engine. My understanding of location sensing thingees are that they are based on triangulation of a signal.  For our purposes, a transmitter in an engine would send a signal to 3 or 4 our sensors around the room that were hooked to a computer. The computer would do the triangulation and act on the result. If the sensor was in the engine, it would have to sense a signal from multiple transmitters, compute it onboard, and then send the results out again (by air or rail.) I think that technology would be more difficult and prone to error. Opinions?Chip: did you ever locate a radio system for sound like you refer to? I vaguely remember then thread, but not the result. [:-^]Mike Tennent
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