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+<HTML>
+<HEAD>
+   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
+   <META NAME="GENERATOR" CONTENT="Mozilla/4.01 [en] (Win95; I) [Netscape]">
+   <TITLE>Magnavox MX4200 GPS Receiver
+</TITLE>
+</HEAD>
+<BODY>
+
+<H3>
+Magnavox MX4200 GPS Receiver</H3>
+
+<HR>
+<H4>
+Synopsis</H4>
+Address: 127.127.9.<I>u</I>
+<BR>Reference ID: <TT>GPS</TT>
+<BR>Driver ID: <TT>GPS_MX4200</TT>
+<BR>Serial Port: <TT>/dev/gps<I>u</I></TT>; 4800 baud, 8-bits, no parity
+<BR>Features: <TT>ppsclock</TT> (required)
+<H4>
+Description</H4>
+This driver supports the Magnavox MX4200 Navigation Receiver adapted to
+precision timing applications. It requires the <TT>ppsclock</TT> line
+discipline or streams module described in the <A HREF="ldisc.htm">Line
+Disciplines and Streams Modules</A> page. It also requires a <A
+HREF="gadget.htm">gadget box</A> and 1-PPS level converter, such as
+described in the <A HREF="pps.htm">Pulse-per-second (PPS) Signal
+Interfacing</A> page.
+
+<P>This driver supports all compatible receivers such as the 6-channel
+MX4200, MX4200D, and the 12-channel MX9212, MX9012R, MX9112.
+
+<P>
+<A HREF="http://www.leica-gps.com/">
+<IMG SRC="pic/9400n.jpg" ALT="Leica MX9400N Navigator" ALIGN=LEFT></A>
+<A HREF="http://www.leica-gps.com/">Leica Geosystems</A> acquired
+the Magnavox commercial GPS technology business in February of 1994.
+They now market and support former Magnavox GPS products such as the
+MX4200 and its successors.</P>
+
+<BR CLEAR=LEFT>
+Leica MX9400N Navigator.
+
+<P>
+
+<H4>
+Operating Modes</H4>
+This driver supports two modes of operation, static and mobile, controlled
+by clock flag 2.
+
+<P>In static mode (the default) the driver assumes that the GPS antenna
+is in a fixed location. The receiver is initially placed in a "Static,
+3D Nav" mode, where latitude, longitude, elevation and time are calculated
+for a fixed station. A DOP-weighted running average position is calculated
+from this data. After 24 hours, the receiver is placed into a "Known Position"
+mode, initialized with the calculated position, and then solves only for
+time.
+
+<P>In mobile mode, the driver assumes the GPS antenna is mounted on a moving
+platform such as a car, ship, or aircraft. The receiver is placed in "Dynamic,
+3D Nav" mode and solves for position, altitude and time while moving. No
+position averaging is performed.
+<H4>
+Monitor Data</H4>
+The driver writes each timecode as received to the <TT>clockstats</TT>
+file.  Documentation for the <CITE>NMEA-0183</CITE> proprietary
+sentences produced by the MX4200 can be found in
+<A HREF="mx4200data.htm">MX4200 Receiver Data Format</A>.
+
+<H4>
+Fudge Factors</H4>
+
+<DL>
+<DT>
+<TT>time1 <I>time</I></TT></DT>
+
+<DD>
+Specifies the time offset calibration factor, in seconds and fraction,
+with default 0.0.</DD>
+
+<DT>
+<TT>time2 <I>time</I></TT></DT>
+
+<DD>
+Not used by this driver.</DD>
+
+<DT>
+<TT>stratum <I>number</I></TT></DT>
+
+<DD>
+Specifies the driver stratum, in decimal from 0 to 15, with default 0.</DD>
+
+<DT>
+<TT>refid <I>string</I></TT></DT>
+
+<DD>
+Specifies the driver reference identifier, an ASCII string from one to
+four characters, with default <TT>GPS</TT>.</DD>
+
+<DT>
+<TT>flag1 0 | 1</TT></DT>
+
+<DD>
+Not used by this driver.</DD>
+
+<DT>
+<TT>flag2 0 | 1</TT></DT>
+
+<DD>
+Assume GPS receiver is on a mobile platform if set.</DD>
+
+<DT>
+<TT>flag3 0 | 1</TT></DT>
+
+<DD>
+Not used by this driver.</DD>
+
+<DT>
+<TT>flag4 0 | 1</TT></DT>
+
+<DD>
+Not used by this driver.</DD>
+</DL>
+Additional Information
+
+<P><A HREF="refclock.htm">Reference Clock Drivers</A>&nbsp;
+<HR>
+<ADDRESS>
+David L. Mills (mills@udel.edu)</ADDRESS>
+
+</BODY>
+</HTML>