Welcome, Guest. Please login or register.

Login with username, password and session length
Forums Search:  


Author Topic: Confused By Etrex Tracklog Time Stamps  (Read 2942 times)

Seldom

  • Expert Advisor
  • *****
  • Posts: 1852
  • Karma: 19
    • View Profile
Confused By Etrex Tracklog Time Stamps
« on: May 14, 2012, 06:41:32 PM »
I live in Utah, Mountain Daylight Time. I went for a hike in Arizona, Mountain Standard Time. My Etrex 30 knew the difference and as soon as I crossed the border the Etrex clock lost an hour. My camera was set to Mountain Standard Time, so when in AZ the camera and the Etrex should have been in sync. However:

When I got back home to Mountain Daylight time I had to adjust the time offset for the Arizona photos 1 hour ahead (to Mountain Daylight Time) to get them to position correctly on the map.

On checking the track log I recorded in AZ it was all shown as Mountain Daylight.  Anybody know what determines the time zone used for the tracklog?  UTC+offset+Daylight and Arizona's peculiarities are ignored even though local time is correctly displayed?

Indrid Cold

  • Moderator
  • Expert Advisor
  • *****
  • Posts: 919
  • Karma: 20
    • View Profile
Re: Confused By Etrex Tracklog Time Stamps
« Reply #1 on: May 14, 2012, 07:41:08 PM »
On checking the track log I recorded in AZ it was all shown as Mountain Daylight.  Anybody know what determines the time zone used for the tracklog?
If you view the raw tracklog with Notepadd++ or other text viewing software you will see that all timestamps are ZULU, so there's something in whatever sofeware you are viewing it with where the issue is.

Seldom

  • Expert Advisor
  • *****
  • Posts: 1852
  • Karma: 19
    • View Profile
Re: Confused By Etrex Tracklog Time Stamps
« Reply #2 on: May 14, 2012, 09:12:01 PM »
I see what you mean, Indrid.  I ended my log at 15:56 Mountain Daylight.  Offset is 7 hours from Greenwich. + 1 hour for Daylight.  Time stamp is 23:56 when viewed in NotePad++.  So I guess that means that the timestamps are interpreted by MapSource based on my CPU's clock settings, and the local time shown on the GPSr isn't used for anything except my info about when to get up in the morning.

Thanks.

LIHIKER

  • Jr. Member
  • **
  • Posts: 30
  • Karma: 2
    • View Profile
Re: Confused By Etrex Tracklog Time Stamps
« Reply #3 on: May 15, 2012, 08:43:28 AM »
Seldom,

    As Indrid Cold indicated time stamp is in UTC. The GPX's data standard is UTC for the time stamp, Lat / Long using WGS 84 Datum, and elevation is in meters.  You can find out  more here  ... http://en.wikipedia.org/wiki/GPS_eXchange_Format