Precision GPS Time Video Overlay Unit Frequently Asked Questions GPSBOXSPRITE2 On this page we try to answer some of the questions most frequently asked about the precision GPS time video overlay unit. If you have a question about the product after reading the documentation or if you require any further information please contact us: sales@pic-osd.com GPSBOXSPRITE documentation Q. How many GPSBOXSPRITE2 do you have left? How long do you think they will last before you sell out? Can I still purchase a GPSBOXSPRITE2 unit? Etc. A. We are not providing a running countdown for the stock of the GPSBOXSPRITE2. Stock is available now. If you wish to make an order you should do so. We will make it clear on our website when the units have sold out. We make it clear that stock is limited now because previously when we stopped production in 2004, we were criticised for not advising potential customers. Q. Will you be restocking the GPSBOXSPRITE2 after those you have now are sold out? Can you make more? Can you keep the GPSBOXSPRITE2 available for longer? Etc. A. As stated the GPSBOXSPRITE2 units are available while stocks last. Currently we do not intend producing any further units. If this changes we will make it known via our website, but it is unlikely. Q. Questions about supposed GPS errors and error correction, effect on timing accuracy, etc. A. Please read the GPSBOXSPRITE2 documentation. This explains how the unit reacts to GPS error conditions. Thanks to the excellent errror analysis of Oliver Kloes and others there is good understanding of these conditions. None of the errors are systematic or long lasting, less than 0.02 % of all timings. They are random, of short duration and can easily be detected from the unit's display. The GPSBOXSPRITE2 unit does not maintain its own clock and is therefore is not susceptible to errors at any single point in time. The time displayed is based on the continuous update of the data received from the GPS receiver and the 1PPS signal. Because the display is continuously updated, any random error in the data will be corrected by subsequent updates. The 1PPS signal, frame time interval, millisecond counter and NMEA serial data provide 4 independent timing references which allow errors to be detected when they do occur. Q. General questions about setup and compatibility etc. A. Please see Bruce Berger's excellent blog post about his setup for an example. Home Back © The BlackBoxCameraTM Company Limited 2010