http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_DataSheet_%28GPS.G 6-HW-09004%29.pdf Regards, Bill Riches, WA2DVU Cape May, NJ ----- I have not been able to locate a spec sheet for there. Do you have a link? Or maybe you could say how these are improved over the M12M? -- Chris Albertson Redondo Beach, California