GPS time and time zone changes

I’m probably assuming too much here. Help me figure out how the clock works (or doesn’t).

This is on a JBL head unit. I’ve got the GPS update selected and Daylight savings time also. The default time zone is set for CST. Now i travel back and forth fairly regularly between CST and EST.

It appears that the GPS is basically just keeping the time accurate and has NO impact on time zone (hour). Can someone confirm that and the fact i have to keep flipping the time zone manually to keep the hour right?? GPS time is not going to correct for time zone. Correct?

 

• Local time is the date/time reported by your PC (as seen by your web browser). If your PC clock is accurate to a second then the other time scales displayed above will also be accurate to within one second.
• UTC, Coordinated Universal Time, popularly known as GMT (Greenwich Mean Time), or Zulu time. Local time differs from UTC by the number of hours of your timezone.
• GPS, Global Positioning System time, is the atomic time scale implemented by the atomic clocks in the GPS ground control stations and the GPS satellites themselves. GPS time was zero at 0h 6-Jan-1980 and since it is not perturbed by leap seconds GPS is now ahead of UTC by 18 seconds.
• Loran-C, Long Range Navigation time, is an atomic time scale implemented by the atomic clocks in Loran-C chain transmitter sites. Loran time was zero at 0h 1-Jan-1958 and since it is not perturbed by leap seconds it is now ahead of UTC by 27 seconds.
• TAI, Temps Atomique International, is the international atomic time scale based on a continuous counting of the SI second. TAI is currently ahead of UTC by 37 seconds. TAI is always ahead of GPS by 19 seconds.

 

Ok got that. I’m still trying to figure out if the settings will change the time based on time zone.

 

I had all the auto settings on for mine (JBL too) and this weekend it was off by 6 hours. I had to manually set the correct time. The minutes were wrong too so it wasn't a matter of time zones or 24 vs 12 hour time format.