Local Time Offset
Printed From: Avidyne
Category: Avidyne General
Forum Name: IFD 5 Series & IFD 4 Series Touch Screen GPS/NAV/COM
Forum Description: Topics on Avidyne's IFD 5 Series and IFD 4 Series Touch Screen GPS/NAV/COM
URL: http://forums.avidyne.com/forum_posts.asp?TID=733
Printed Date: 15 May 2024 at 5:52pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Local Time Offset
Posted By: DavidBunin
Subject: Local Time Offset
Date Posted: 12 Jul 2015 at 9:25pm
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I’m going to rant for a moment. Why must I set the “Local Time Offset” in the User Settings page? This thing is a figgen’ GPS! It already knows what time zone I’m in. This thing is an FMS! It knows where I’m headed. I can understand having the ability to override the offset for special cases, but there should be an “AUTO” option, and it should be the default value. David Bunin |
Replies:
Posted By: brou0040
Date Posted: 12 Jul 2015 at 9:51pm
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Agree, just like how phones update as you are flying. |
Posted By: MysticCobra
Date Posted: 13 Jul 2015 at 12:23pm
| To be fair, the logic for "what is my local time-of-day" for your phone lives in your cell provider's infrastructure, not inside the phone. |
Posted By: AviJake
Date Posted: 15 Jul 2015 at 12:45pm
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Yeah, it's actually quite tricky. We've had it on our list of candidate features for a long time. The level of effort required has not justified the added benefit when compared to features that have made it into a specific release definition. I frankly suspect it will remain in that category for quite some time. ------------- Steve Jacobson sjacobson@avidyne.com |
Posted By: chflyer
Date Posted: 15 Jul 2015 at 1:35pm
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This isn't quite as simple to implement as it might seem due to the need to take daylight savings time changes in the spring and fall into consideration. I don't think this information is included in the GPS satellite signals, so a gps would need to have all the necessary date/time change tables on-board. The data also changes from year to year. In the continental US that may not seem like such a big deal because everyone changes at the same date/time. Outside the US, there are many complications. In Canada, for example, all the provinces change in step with the US except most of Saskatchewan, some regions of British Columbia, small region of Nunavut, small region of Quebec, small region of Ontario which are on the same time year round and never change. Imagine a gps needing to always know the right Zulu delta for this geographic patchwork? Most European countries change in step with each other, but on a different weekend than the US. Other regions are worse (e.g. S. America). Take a look at this web link to get an idea of the complexity: http://www.timeanddate.com/time/dst/2015.html ------------- Vince |
Posted By: AviJake
Date Posted: 15 Jul 2015 at 2:02pm
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Right. That's exactly what I meant with the level of effort vs the reward. ------------- Steve Jacobson sjacobson@avidyne.com |
Posted By: brou0040
Date Posted: 15 Jul 2015 at 8:32pm
I didnt realize this, and that this was a significant level of effot. |
MysticCobra wrote: