Roger, See the old wxqc thread found here: http://pond1.gladstonefamily.net:8080/pipermail/wxqc/2004-November/00000 9.html The problem described there is precisely the same as yours. As Dave said, that is a WL bug corrected in version 5.5. WL5.4 does not consider calibration offsets in the APRS report. Rex K8CYJ-5 AR863