show examples for sensors. use nmea as suggested by mbalmer, henning agrees.

src/etc/ntpd.conf

@@ -1,4 +1,4 @@
-# $OpenBSD: ntpd.conf,v 1.8 2007/07/13 09:05:52 henning Exp $
+# $OpenBSD: ntpd.conf,v 1.9 2008/10/10 11:46:22 sthen Exp $
 # sample ntpd configuration file, see ntpd.conf(5)
 
 # Addresses to listen on (ntpd does not listen by default)
@@ -10,3 +10,9 @@
 # use a random selection of 8 public stratum 2 servers
 # see http://support.ntp.org/bin/view/Servers/NTPPoolServers
 servers pool.ntp.org
+
+# use a specific local timedelta sensor (radio clock, etc)
+#sensor nmea0
+
+# use any detected timedelta sensor
+#sensor *