Explain 5Div GPS to me

[wockawocka]

Because I set it to correct the time on my 5Div and a week on, both my clocks say different times....

(DST is set the same on each) - I was hoping I could trust it to sync all three body clocks to make ordering easier in Lightroom. It doesn't appear to be happening.

 

[Maximilian]

GPS in general is a time based - better said transit time based - system.
You need precise information about time and position of located satellites and a really precise clock inside the GPS receiver. Normal quartz clock technology is not precise enough.
The GPS signal includes a clock signal that allows the GPS receiver to synchronize to the GPS clock and calculate position if at least 4 satellite signals are received. This makes the receiver much cheaper and portable.
Otherwise you might need an atomic clock

Now to the 5D4:
The camera has an internal quartz clock that works independent from the GPS system.
It seems that this one is not synchronized with the GPS time generated inside the GPS receiver.
Maybe there is a synchronization function included but not activated, or maybe it's just not there.
I don't know, which one of these two time signals is written into which part of the exif data but you'll surely find that information by internet search.

So you have two independent time signals. And depending on the quality of the quartz those two time values can differ within a short time period. I would expect a few seconds within a few weeks.
If it's more than a minute within a month IMO you should refer to Canon if that is normal.

I hope that helps a bit.

By the way:
What is the third clock you mentioned inside the body?

Edit: I did a quick search in the 5D4 manual, didn't find any "third clock" but an "Auto-update" function for synchronizing the internal clock with the GPS clock. Refer to the GPS chapter and/or the GPS menu of the camera.

 

[wockawocka]

GPS in general is a time based - better said transit time based - system.
You need precise information about time and position of located satellites and a really precise clock inside the GPS receiver. Normal quartz clock technology is not precise enough.
The GPS signal includes a clock signal that allows the GPS receiver to synchronize to the GPS clock and calculate position if at least 4 satellite signals are received. This makes the receiver much cheaper and portable.
Otherwise you might need an atomic clock

Now to the 5D4:
The camera has an internal quartz clock that works independent from the GPS system.
It seems that this one is not synchronized with the GPS time generated inside the GPS receiver.
Maybe there is a synchronization function included but not activated, or maybe it's just not there.
I don't know, which one of these two time signals is written into which part of the exif data but you'll surely find that information by internet search.

So you have two independent time signals. And depending on the quality of the quartz those two time values can differ within a short time period. I would expect a few seconds within a few weeks.
If it's more than a minute within a month IMO you should refer to Canon if that is normal.

I hope that helps a bit.

By the way:
What is the third clock you mentioned inside the body?

Edit: I did a quick search in the 5D4 manual, didn't find any "third clock" but an "Auto-update" function for synchronizing the internal clock with the GPS clock. Refer to the GPS chapter and/or the GPS menu of the camera.

Thanks!

I'm talking about clocks between bodies. So I have three cameras it total, 2 for me and another for my second. I was hoping the GPS would update the in camera clock.

 

[Maximilian]

...
By the way:
What is the third clock you mentioned inside the body?

Edit: I did a quick search in the 5D4 manual, didn't find any "third clock" but an "Auto-update" function for synchronizing the internal clock with the GPS clock. Refer to the GPS chapter and/or the GPS menu of the camera.

Thanks!

I'm talking about clocks between bodies. So I have three cameras it total, 2 for me and another for my second. I was hoping the GPS would update the in camera clock.

Got it.
As I wrote: you can activate a clock sync to GPS according to the GPS chapter and/or the GPS menu of the camera.
If that doesn't work with several bodies with GPS (of the same type) I'd be puzzled, too.