NMEA Reference Manual
SiRF Technology, Inc.
148 East Brokaw Road
San Jose, CA 95112 U.S.A.
Phone: +1 (408) 467-0410
Fax: +1 (408) 467-0420
www.SiRF.com
1050-0042
January 2005, Revision 1.3
SiRF, SiRFstar, and SiRF plus orbit design are registered in the U.S. Patent and Trademark Office. This document
contains information on a product under development at SiRF. The information is intended to help you evaluate
this product. SiRF reserves the right to change or discontinue work on this product without notice.
ii NMEA Reference Manual—January 2005
NMEA Reference Manual
Copyright © 1996-2005 SiRF Technology, Inc. All rights reserved.
No part of this work may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or by any information storage or retrieval system
without the prior written permission of SiRF Technology, Inc. unless such copying is expressly
permitted by United States copyright law. Address inquiries to Legal Department, SiRF Technology,
Inc., 148 East Brokaw Road, San Jose, California 95112, United States of America.
About This Document
This document contains information on SiRF products. SiRF Technology, Inc. reserves the right to
make changes in its products, specifications and other information at any time without notice. SiRF
assumes no liability or responsibility for any claims or damages arising out of the use of this document,
or from the use of integrated circuits based on this document, including, but not limited to claims or
damages based on infringement of patents, copyrights or other intellectual property rights. SiRF makes
no warranties, either express or implied with respect to the information and specifications contained in
this document. Performance characteristics listed in this data sheet do not constitute a warranty or
guarantee of product performance. All terms and conditions of sale are governed by the SiRF Terms
and Conditions of Sale, a copy of which you may obtain from your authorized SiRF sales
representative.
Getting Help
If you have any problems contact your SiRF representative or call or send an e-mail to the SiRF
Technology support group:
phone +1 (408) 467-0410
e-mail support@sirf.com
iii
Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
1. Output Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
GGA —Global Positioning System Fixed Data . . . . . . . . . . . . . . . . . . 1-2
GLL—Geographic Position - Latitude/Longitude . . . . . . . . . . . . . . . . 1-3
GSA—GNSS DOP and Active Satellites. . . . . . . . . . . . . . . . . . . . . . . 1-4
GSV—GNSS Satellites in View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
MSS—MSK Receiver Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
RMC—Recommended Minimum Specific GNSS Data. . . . . . . . . . . . 1-6
VTG—Course Over Ground and Ground Speed . . . . . . . . . . . . . . . . . 1-7
ZDA—SiRF Timing Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
150—OkToSend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
2. Input Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Transport Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
NMEA Input Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
100—SetSerialPort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
iv NMEA Reference Manual—January 2005
101—NavigationInitialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
102—SetDGPSPort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
103—Query/Rate Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
104—LLANavigationInitialization . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
105—Development Data On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
106—Select Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
MSK—MSK Receiver Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
v
Figures
