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+.\"	$OpenBSD: nmea.4,v 1.1 2006/06/01 20:10:28 mbalmer Exp $
+.\"
+.\" Copyright (c) 2006 Marc Balmer <mbalmer@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd May 42, 2006
+.Dt NMEA 4
+.Os
+.Sh NAME
+.Nm nmea
+.Nd line discipline for NMEA0183 devices
+.Sh SYNOPSIS
+.Cd "pseudo-device nmea" Op Ar count
+.Sh DESCRIPTION
+This line discipline provides an interface to NMEA talking devices
+which are connected to a host through a serial line.
+.Pp
+The line discipline is enabled by a sequence:
+.Bd -literal -offset indent
+#include <sys/ttycom.h>
+int ldisc = NMEADISC, fildes; ...
+ioctl(fildes, TIOCSETD, &ldisc);
+.Ed
+.Pp
+While application program can still use the device as if it had the
+default (termios) line discipline attached, the lince discipline
+maintains a timedelta sensor in the kernel.
+.Sh SEE ALSO
+.Xr tty 4
+.Sh HISTORY
+The
+.Nm
+interface appeared in
+.Ox 4.0 .
+.Sh AUTHORS
+The
+.Nm
+line discpiline was written by
+.An Marc Balmer Aq mbalmer@openbsd.org .