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BT-1000X -> setting device time?
Hi there,
I just got myself a QStarz BT-1000X. After some struggle to get it connected in BT747 in gentoo (the good old ttyACM0 problem), it is finally working :) . Thanks for a great piece of software!
I was wondering one thing: how do I set the device time?
This my first GPS unit, and I'm going to use the devide primarily for logging and photo geotagging. I was under the assumption that the first thing I needed to do was to synchronize the clocks of the GPS device and my camera. Is that correct? What are the typical steps to get started with gps logging?
Many thanks!
Tim
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>I was wondering one thing:
>I was wondering one thing: how do I set the device time? You don't. Once of the core parts of GPS are accurate clocks. The device is synchronised to the satelite cloud. It has to be or the location calculations will be wrong. > I was under the assumption that the first thing I needed to do was to > synchronize the clocks of the GPS device and my camera. Is that correct? Yes, you synchronise your camera to the GPS. BT747 knows about time-zones so you don't have to set your camera to UTC as used by the GPS system - the software applies the time-zone offset when correlating times and positions. But your camera time has to be accurate or the correlations will be off.
Hello, you have not to setup
Hello,
you have not to setup or to correct the time of the camera! Your should let the time of the carmera stable!
In the first step on each day you have to photograph the GPS clock. Using for this step a PC or PDA or mobile phone. Each good photo tagging software have the capability to synchronize the clock between camera and GPS device with a time offset. If you has photograph the clock before you make the photos then you can determinate the offset by the diffetrent between clock picture content and the EXIF header from clock picture. Put in this difference as offset in the photo tagging software.
greetinngs Joern Weber
Matthew and Joern are both
Matthew and Joern are both right.
It is very important to know the offset between the GPS time (automatically set) and the camera time (set manually).
The GPS time will be very accurate while the camera time generally drifts: if the offset is perfect at day 0, you can find an offset of 1 minute 14 days later. 1 minute is not necessarilly a problem, and it is best to tell the tagging tools that the offset is 30 seconds in that case.
Joern suggest to take a picture of the GPS clock time. You can do so by taking a picture of the shown time in the BT747 desktop application, or by taking a picture of the GPS time shown on your mobile phone when it is connected to the GPS. The J2ME version of BT747 can do that.
Personnally, I set my camera time to the UTC0 time. Otherwise it is a headache with the summer and winter times, time zone crossings and so on. For long trips, I correct my camera time at the beginning of the trip and verify it by taking a picture of the time. To get an idea of the drift, I take another picture of the GPS time at the end of the trip. I keep these pictures with the rest of the pictures and I save the GPS track logs in the same directory as where the pictures are located in order to find it back in the future.
Thanks all of you, I have a
Thanks all of you, I have a much better idea of how this whole tagging business works now :) . And thanks also for the tip on taking a shot of the GPS time, I will follow this process too :).
Cheers!
Tim.
Hello Mario, two
Hello Mario,
two questions:
Can build in a function in the ME version to synchronize the mobbile phone internaly time with the GPS-Time for the internal camera.
And can your build in a separately sceen page in the ME version with big letter to display the GPS-Time to take a pictury with a external camera?
Greetings Joern Weber
1) I need to check that out -
1) I need to check that out - this was already requested by someone. There are a number of things to handle such as the time zone, etc. And I need to find the java function that permits the setting of the time (if it exists). I recently bought a new phone ant that one simply gets the time from the network (when configured to do so).
2) That should not be to difficult to do.