As per http://gpsd.berlios.de/protocol-transition.html#_virtue_is_rewarded
gps_query should be replace with gps_stream

Thanks
-Khem
Index: prismstumbler-0.7.4pre1/src/daemon/gpsctl.c
===================================================================
--- prismstumbler-0.7.4pre1.orig/src/daemon/gpsctl.c
+++ prismstumbler-0.7.4pre1/src/daemon/gpsctl.c
@@ -41,6 +41,5 @@ update_gpsdata ()
 {
 	if(!gps_conn)
 		return;
-
-	gps_query (gps_conn, "p");
+	gps_stream(gps_conn, WATCH_ENABLE, NULL);
 }