We were really excited this weekend when we discovered the new and improved interface on the the iSXView app for Geneq’s submeter iSXBlue II GNSS. The original version of the app was quite sparse and didn’t have much going for it with three views to choose from; Location, Adapter, and Data. Only the Location view had useful information with a small base map, coordinates, altitude, and accuracy estimate. It was pretty slim considering the massive amount of information the user can garner from having the iSXBlue plugged into a laptop running Geneq’s SXBlue Config software. (click on images to enlarge)
The updated iSXView (version 2.01; updated December 16, 2014) incorporates much of the information previously only available with the aforementioned configuration software. Now iSXView has four page views; Location, Satellites, Data, and Configuration.
Much of this app update applies to the Location and Satellites views. First, the Satellite page (seen on the right) is a great addition as it provides a sky plot of the currently available satellites and breaks them down by GPS, GLONASS, or WAAS satellites. On the bottom half of the screen, the user can toggle between the GPS, WAAS, and GLONASS to see the number of each type being tracked versus used. It is a nice visual to assist with verification that the unit is working correctly.
Much of the information on the Satellites view can also be seen on the Location view (see below), which is typically the page users will utilize the most. The accuracy estimate has more “accurately” been named Horizontal Accuracy, which is preset to meters. The app update has also added the quick visual showing the number of GPS and GLONASS satellites being used compared to the total available, or “Tracked”.
Another useful group of readings provided with this update is the DOPs, or Dilution of Precision, which is a measure of the current satellite geometry. Having numerous satellites available provides good, low values of DOP. A low DOP indicates a higher probability of accuracy.
The new readings on the updated Location view include Horizontal (HDOP), Vertical (VDOP), and Positional (PDOP). It is always a good idea for the user to check the PDOP value to help determine if the location data is highly accurate (PDOP below 4), or probably so-so (PDOP of 5 – 8), or poor (PDOP of 9 or more).
Notice in the screen shot to the left, the horizontal accuracy was 0.19 meters and the PDOP = 1.20, and a total of 17 satellites were being used. For reference, this was an open sky view location and the accuracy at the time ranged from 0.19 to 0.37 meters. Refer to the next two figures.
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