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visualgps llc visualgps software and services home products articles contact products visualgpsview a free tool to monitor gps output nmeatime2 an advanced pc gps time synchronization tool visualgps legacy legacy visualgps application nmeatime legacy a pc gps time synchronization tool visualgps xp legacy legacy visualgps application clock maze screen saver a free screen saver that solves a maze and shows the time visualgpsview free download if you like our software please donate suggested donation 5usd visualgpsview freeware incorporates many advanced features that show the status of the gps receiver via the nmea 0183 protocol its sole purpose is to display graphically specific nmea 0183 sentences for gps and position analysis features nmea glonass supports gps nmea and glonass nmea azimuth and elevation plot view all satellites that are in view each satellite identifies its pseudo random number prn and its azimuth and elevation scatter plot the scatter plot shows individual position samples referenced to several type of reference types next sample average or user defined signal quality snr window monitor satellite signal to noise ratios and see them graphically on the screen the signal quality window will grow or shrink to accommodate number of satellites in view position plot monitor latitude longitude and altitude averages nmea command monitor view nmea sentences as they are received nmea recording and playback record nmea directly to a file or read nmea from a file nmea files consists of standard nmea sentences in text ascii characters requirements gps receiver connected to a rs 232 port or usb with nmea 0183 output windows 7 to window 10 visualgps decodes the following nmea 0183 sentences gpgga and glgga gpgsa and glgsa gpgsv and glgsv screen shots nmeatime2 pc gps time synchronization download free for 30 days version release notes beta version 2 0 available click for more information please uninstall any old versions before installing new version the price for nmeatime2 is 20 48usd if you purchase nmeatime2 we will send you a registration key via email within 48 hours nmeatime2 is pc time synchronization software that synchronizes the pc clock to the time from a gps receiver nmeatime2 is set up as a system service where the pc clock is disciplined to the nmea string from the gps the control loop uses the same techniques in disciplining ocxo oscillators and atomic rubidium clocks by charactering the arrival of nmea messages nmeatime2 uses advanced digital filters to minimize communication jitter and achieve the best reference to train the pc clock to because of this there are some requirements that need to be met specifically the rate output of nmea message gpgga and gprmc it s getting more difficult to find a pc with a native rs 232 serial communication port most gps receivers that interface to a pc use a usb the majority of the usb gps receivers will look to the pc as if it is a serial port however the modern usb gps looks to the pc as a usb to serial driver that emulates the serial port in the usb world it s referred as a cdc communication device class device nmeatime2 will use the nmea string gpgga transmitted from the gps time tag the first character of the that command and use this as a timing reference as you would expect there are delays between the 1pps epoch and the rs 232 causing software jitter the delay can be calibrated out nmeatime2 will use digital filtering the red line you see in the time difference plot see below and discipline the pc clock to this reference read more information here requirements supports windows 7 8 8 1 and windows 10 the minimum nmea sentence requirements matter the most important is that the gpgga and gprmc message output once per second gpgga must be once second gprmc must be once second gpzda must be once second nmeatime will use this sentence for time if not available then nmeatime will use gga rmc for time gpgsa every two seconds gpgsv every two seconds screen shots visualgps legacy download if you like visualgps and would like to support more products like these please donate suggest donation 5 usd currently visualgps is over 10 years old nmea support is only limited to gps nmea strings not glonass or galileo we recommend that you download visualgpsview visualgps freeware incorporates many advanced features found in professional programs its sole purpose is to display graphically specific nmea 0183 sentences and show the effects of selective availability sa features azimuth and elevation graph view all satellites that are in view each satellite identifies its pseudo random number prn and its azimuth and elevation also plot and print the physical mask angle survey the survey window displays both position and xdop hdop and vdop parameters the ability for user selectable hdop vdop color thresholds for position averaging make a great utility also monitor standard deviation and effects of selective availability that s not all print the results graphically signal quality snr window monitor satellite signal to noise ratios and see them graphically on the screen the signal quality window will grow or shrink to accommodate number of satellites in view navigation monitor latitude longitude and altitude nmea command monitor view nmea sentences as they are received requirements gps receiver connected to a rs 232 port with nmea 0183 output nmea demo file included for those who do not have a gps receiver windows 2000 sp4 windows xp vista or windows 7 486 100mhz or higher microprocessor svga at least 1024x768 resolution 16 megabytes of ram 6 megabytes of disk space one available rs 232 port or captured nmea text file included visualgps decodes the following nmea 0183 sentences gpgga gpgsa gpgsv download download a free copy of visualgps program it is a 32 bit program written for both the windows 2000 xp and vista environments this software is freeware and cost is free download nmeatime legacy as of january 1st 2018 nmeatime legacy will no longer be supported please use nmeatime2 as an alternative download purchase nmeatime v5 8 100 to purchase this product please contact visualgps llc currently nmeatime is over 10 years old it only supports gps nmea string not glonass or galileo we recommend that you download nmeatime2 nmeatime will automatically set your pc clock using a gps receiver connected to the serial port of a pc or to the national institute of standards and technology nist time servers over the internet using network time or the time from a gps receiver nmeatime will keep your computer referenced to an atomic time standard also included with nmeatime is a nasa type desktop clock configurable to show day of year 24 hour time or local time color and size features digital desktop time code clock like nasa has analog desktop clock uses gps time to set your pc clock nmea 0183 v2 20 3 01 compatible software generated irig b output requires sound card two network time protocols daytime nist acts compatible and sntp compatible programmable time setting rate selectable gps nmea message for time reference random time server select mode from an editable server list accepts 1 pulse per second 1pps input in to rs 232 dsr or cts port bonus screen saver clockmaze transparent clock see what is behind the clock xp and win2000 only requirements for gps time gps receiver connected to a rs 232 port with nmea 0183 output for network time access to the internet windows 95 98 win2000 xp winnt4 0 or higher with internet explorer 4 0 or higher pentium 166mhz or higher microprocessor svga at least 800x600 resolution 16 megabytes of ram 2 megabytes of disk space one available rs 232 port for gps time sound board for irig output nmea gps nmeatime decodes the following nmea 0183 sentences gpgga or gprmc or gpzda gpgsa gpgsv compatible with nmea 0183 version 2 01 3 01 visualgps xp legacy download as of january 1st 2019 visualgpsxp legacy will no longer be supported purchase visualgpsxp for 9 95 usd welcome to the visualgpsxp multipurpose gps utility please note that visualgpsxp uses specific nmea sentences to display data graphically visualgpsxp is a general purpose utility for monitoring the output of a gps receiver using the nmea data from the gps receiver visualgpsxp will display various statuses graphically tools such as a survey utility average the position and shows accuracy of the gps receiver in a static application other features such as analog gauges show altitude speed vertical speed and direction one additional feature is the capability to connect and share a gps receivers data over the internet features user definable window sizes and positions multiple connection paths to a gps receiver connect using an rs 232 port connect using the network internet connect or read data directly from a nmea text file analog display instruments altimeter speedometer compass vertical speed graphical gps status signal quality azimuth elevation plot gps analyses monitor nmea data static position averaging and statistics antenna mask determination nmea 0813 version 2 0 3 01 compatible clock and maze screen saver download if you like our software please donate suggested donation 2usd clockmaze is a simple screen saver that creates a maze solves it and shows the current time you can set up items such as solve color maze color and solve speed it s free enjoy features screen saver is digitally signed multiple monitor support custom colors free screen shots contact visualgps is located in anaheim california usa if you have any questions or comments or simply send us a email or twitter info visualgps net twitter visualgps here you will find miscellaneous articles and code snippets if you have any question please don t hesitate to contact me you can find the contact information on the contact page monte variakojis gps week rollover every 19 7 years gps suffers a time rollover similar to the y2k problem but a but more complicated click below to find out more gps time armageddon should you worry nmeaparser the nmeaparser article will show you how a typical nmea string is constructed and parsed the article resides on github and the code documented and supports c the source code supports windows mac and linux as a bonus i ve included a qt project that makes use of the nmeaparser and shows satellite signal quality position and satellite signal to noise snr nmeaparser article on github nmeaparser source code on github application end user license visualgps llc thesoftware software application will be referred as software application through the remainder of this document you should carefully read the following terms and conditions before using this software unless you have a different license agreement signed by visualgps llc your use distribution or installation of this copy of this software application indicates your acceptance of this license if you do not agree to any of the terms of this license then do not install distribute or use this copy of software application if you paid visualgps llc for this copy individually you may return it unused within thirty 30 days after purchase for a full refund of your payment this copy of software application may either be used by a single person who uses the software personally on one or more computers or installed on a single workstation used non simultaneously by multiple people but not both this is not a concurrent use license you may access this copy through a network provided that you have obtained an individual software application license for each workstation that will access software application through the network for instance if 8 different workstations will access software application on the network each workstation must have its own software application license regardless of whether they use software application at different times or concurrently this software and all accompanying files data and materials is distributed as is and with no warranties of any kind whether express or implied good data processing procedure dictates that any program be thoroughly tested with non critical data before relying on it the user must assume the entire risk of using the program this disclaimer of warranty constitutes an essential part of the agreement any liability of visualgps llc will be limited exclusively to refund of purchase price in addition in no event shall visualgps llc or its principals shareholders officers employees affiliates contractors subsidiaries or parent organizations be liable for any incidental consequential or punitive damages whatsoever relating to the use of software application or your relationship with visualgps llc in addition in no event does visualgps llc authorize you to use software application in applications or systems where visualgps llc failure to perform can reasonably be expected to result in a significant physical injury or in loss of life any such use by you is entirely at your own risk and you agree to hold visualgps llc harmless from any claims or losses relating to such unauthorized use this agreement is the complete statement of the agreement between the parties on the subject matter and merges and supersedes all other or prior understandings purchase orders agreements and arrangements the laws of the state of california shall govern this agreement exclusive jurisdiction and venue for all matters relating to this agreement shall be in courts and located in the state of california and you consent to such jurisdiction and venue all rights of any kind in software application which are not expressly granted in this license are entirely and exclusively reserved to and by visualgps llc you may not rent lease modify translate reverse engineer decompile disassemble or create derivative works based on software application there are no third party beneficiaries of any promises obligations or representations made by visualgps llc herein disclaimer in no event shall visualgps llc be liable for any loss of profit or any other commercial or private damage including but not limited to special incidental consequential or other damages resulting from or in any way connected with the use of this software visualgps llc specifically disclaims any other warranties expressed or implied including but not limited to the implied warranties of merchantability and fitness for a particular use warning do not operate software application while driving a vehicle software application is not designed as a primary navigational aid failure to pay full attention while operating the vehicle and road conditions while operating the vehicle could result in an accident or collision with property damage and personal injury copyright 2020 visualgps inc all rights reserved visualgps is a trademark of visualgps llc anaheim ca