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NMEATIme2
An advanced PC GPS time synchronization Tool
NMEATIme (Legacy)
A PC GPS time synchronization tool
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Clock Maze Screen Saver
A Free screen saver that sloves a maze and shows the time
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:
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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
Free for 30 days.
*** 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.
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.
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- 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
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Screen Shots
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:
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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.
DownloadAs of January 1st 2018, NMEATime (Legacy) will no longer be supported. Please use NMEATime2 as an alternative.
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
As of January 1st 2019, VisualGPSXP (Legacy) will no longer be supported.
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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 |
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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: |
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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 GithubNMEAParser 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.
-->Versions supported
- Windows 10
- Windows 8.1
Applies to
- Device manufacturers of CDC Control devices
Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
In Windows 10, the driver has been rewritten by using the Kernel-Mode Driver Framework that improves the overall stability of the driver.
- Improved PnP and power management by the driver (such as, handling surprise removal).
- Added power management features such as USB Selective Suspend.
In addition, UWP applications can now use the APIs provided by the new Windows.Devices.SerialCommunication namespace that allow apps to talk to these devices.
Usbser.sys installation
Load the Microsoft-provided in-box driver (Usbser.sys) for your Communications and CDC Control device.
Note
If you trying to install a USB device class driver included in Windows, you do not need to download the driver. They are installed automatically. If they are not installed automatically, contact the device manufacturer. For the list of USB device class driver included in Windows, see USB device class drivers included in Windows.
Windows 10
In Windows 10, a new INF, Usbser.inf, has been added to %Systemroot%Inf that loads Usbser.sys as the function device object (FDO) in the device stack. If your device belongs to the Communications and CDC Control device class, Usbser.sys is loaded automatically.You do not need to write your own INF to reference the driver. The driver is loaded based on a compatible ID match similar to other USB device class drivers included in Windows.
USBClass_02
USBClass_02&SubClass_02
- If you want to load Usbser.sys automatically, set the class code to 02 and subclass code to 02 in the Device Descriptor. For more information, see USB communications device class. With this approach, you are not required to distribute INF files for your device because the system uses Usbser.inf.
- If your device specifies class code 02 but a subclass code value other than 02, Usbser.sys does not load automatically. Pnp Manager tries to find a driver. If a suitable driver is not found, the device might not have a driver loaded. In this case, you might have to load your own driver or write an INF that references another in-box driver.
- If your device specifies class and subclass codes to 02, and you want to load another driver instead of Usbser.sys, you have to write an INF that specifies the hardware ID of the device and the driver to install. For examples, look through the INF files included with sample drivers and find devices similar to your device. For information about INF sections, see Overview of INF Files.
Note
Microsoft encourages you to use in-box drivers whenever possible. On mobile editions of Windows, such as Windows 10 Mobile, only drivers that are part of the operating system are loaded. Unlike desktop editions, it is not possible to load a driver through an external driver package. With the new in-box INF, Usbser.sys is automatically loaded if a USB-to-serial device is detected on the mobile device.
Windows 8.1 and earlier versions
In Windows 8.1 and earlier versions of the operating system, Usbser.sys is not automatically loaded when a USB-to-serial device is attached to a computer. To load the driver, you need to write an INF that references the modem INF (mdmcpq.inf) by using the Include directive. The directive is required for instantiating the service, copying inbox binaries, and registering a device interface GUID that applications require to find the device and talk to it. That INF specifies 'Usbser' as a lower filter driver in a device stack.
The INF also needs to specify the device setup class as Modem to use mdmcpq.inf. Under the [Version] section of the INF, specify the Modem and the device class GUID. for details, see System-Supplied Device Setup Classes.
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For more information, see How to use or reference the Usbser.sys driver from universal serial bus (USB) modem .inf files.
Configure selective suspend for Usbser.sys
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Starting in Windows 10, Usbser.sys supports USB Selective Suspend. It allows the attached USB-to-serial device to enter a low power state when not in use, while the system remains in the S0 state. When communication with the device resumes, the device can leave the Suspend state and resume Working state. The feature is disabled by default and can be enabled and configured by setting the IdleUsbSelectiveSuspendPolicy entry under this registry key:
To configure power management features of Usbser.sys, you can set IdleUsbSelectiveSuspendPolicy to:
'0x00000001': Enters selective suspend when idle, that is, when there are no active data transfers to or from the device.
'0x00000000': Enters selective suspend only when there are no open handles to the device.
That entry can be added in one of two ways:
Write an INF that references the install INF and add the registry entry in the HW.AddReg section.
Describe the registry entry in an extended properties OS feature descriptor. Add a custom property section that sets the bPropertyName field to a Unicode string, 'IdleUsbSelectiveSuspendPolicy' and wPropertyNameLength to 62 bytes. Set the bPropertyData field to '0x00000001' or '0x00000000'. The property values are stored as little-endian 32-bit integers.
For more information, see Microsoft OS Descriptors.
Develop Windows applications for a USB CDC device
If you install Usbser.sys for the USB CDC device, here are the application programming model options:
Starting in Windows 10, a Windows app can send requests to Usbser.sys by using the Windows.Devices.SerialCommunication namespace. It defines Windows Runtime classes that can use to communicate with a USB CDC device through a serial port or some abstraction of a serial port. The classes provide functionality to discover such serial device, read and write data, and control serial-specific properties for flow control, such as setting baud rate, signal states.
In Windows 8.1 and earlier versions, you can write a Windows desktop application that opens a virtual COM port and communicates with the device. For more information, see:
Win32 programming model:
.NET framework programming model: