--- Log opened Tue Mar 12 00:00:14 2013
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16:14 #navit: < xenos1984> hm... seems there was a question on tomtom yesterday
16:14 #navit: < xenos1984> indeed, tomtom uses a file system that does not support creating links
16:15 #navit: < xenos1984> that caused me some trouble when i ported navit for the first time... but i just placed the files in the binary package in different folders, so that there are no links needed
16:16 #navit: < xenos1984> so just unpacking the precompiled binaries should not create links
16:16 #navit: < xenos1984> i have no idea where this error comes from...
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16:56 #navit: < ZeroOne01> hey guys, how does navit calculate the ETA (the time to arrival and time of arrival) ?
16:57 #navit: < ZeroOne01> last time i used it there was a difference of about 5 minutes ?!?
16:58 #navit: < ZeroOne01> sry 15
16:58 #navit: < ZeroOne01> iirc...
17:05 #navit: < ZeroOne01> 5 minutes - checked the picture i made..
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17:48 #navit: <@cp15> ZeroOne01, what difference?
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19:14 #navit: < ZeroOne01> let's imagine it's 08:00, navit says i'll arrive in 10 Minutes then ETA is 08:15 ...
19:15 #navit: < ZeroOne01> 5 Minutes difference
19:15 #navit: < ZeroOne01> navigation.item.destination_time[remaining] and [arrival] differ by 5 minutes
19:17 #navit: < ZeroOne01> svn 5395
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19:25 #navit: < xenos1984> i guess you checked already that your clock is set correctly and the time on the navigation device is really 8:00, not 8:05?
19:25 #navit: < ZeroOne01> i'll load up the picture... just a second..
19:26 #navit: < xenos1984> just tried with the version i have on my laptop (5400)... seems to work fine for me, both times agree
19:27 #navit: < ZeroOne01> true true... it was the first time i saw this "problem"
19:28 #navit: < ZeroOne01> http://www.seraph.at/pics/navit.jpg
19:29 #navit: < ZeroOne01> take a brief look and count/calculate
19:29 #navit: < ZeroOne01> :-)
19:29 #navit: < xenos1984> indeed, 5 minutes missing...
19:29 #navit: < xenos1984> and the gps time and device time are the same?
19:29 #navit: < ZeroOne01> should be... ntp
19:30 #navit: < ZeroOne01> so a difference yes.. but exactly 5 minutes?
19:30 #navit: < xenos1984> this is strange
19:30 #navit: < xenos1984> what happens if you get close to the destination, i.e., less that 5 minutes left?
19:32 #navit: < ZeroOne01> sry - don't remember... the picture was taken more than a week ago
19:32 #navit: < ZeroOne01> but iirc it says 1min ?!?
19:33 #navit: < ZeroOne01> but eht eta time was 6 or more
19:33 #navit: < xenos1984> hm... don't really have a clue at the moment what is causing this... let me have a look into the source...
19:33 #navit: < ZeroOne01> i can just guess...
19:34 #navit: < ZeroOne01> arrival taken by gps-time and remaining by pc-time
19:34 #navit: < ZeroOne01> or vice versa
19:37 #navit: < xenos1984> but if gps time and pc time are the same, this should not matter? or do they differ by 5 minutes?
19:38 #navit: < xenos1984> i just looked at the code... and have no idea what it does :s
19:38 #navit: < ZeroOne01> i didn't look - becaus it was always correct...
19:40 #navit: < xenos1984> would be good to check this
19:42 #navit: < ZeroOne01> i guess both are calculated from pc-time because for the time from gps you have to enter your timezone
19:42 #navit: < ZeroOne01> vehicle.position_time_iso8601[+01:00;%X]
19:42 #navit: < xenos1984> yes, indeed
19:42 #navit: < ZeroOne01> so, if both are taken from pc-time -> there is still the time difference
19:43 #navit: < xenos1984> well, remaining time is not really calculated using any clock - it's just the time needed to drive the remaining part of the route
19:43 #navit: < xenos1984> this is a timespan, not a point in time
19:44 #navit: < xenos1984> so the question is: to which point in time (aka "now") is this timespan added to get the arrival time?
19:44 #navit: < xenos1984> and as far as i can see it's just local pc time
19:44 #navit: < xenos1984> so: arrival = pc-local-now + remaining
19:45 #navit: < ZeroOne01> must be calculated because driving on highway and driving in the city causes different driving speeds
19:45 #navit: < xenos1984> yes
19:45 #navit: < xenos1984> but if this is true and your pictures shows arrival, remaining and pc-local-now... something must go wrong
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19:49 #navit: < xenos1984> ah, and the current time you display in the upper right corner? is this pc or gps time?
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19:49 #navit: < ZeroOne01> the picture shows gps time +1
19:49 #navit: < xenos1984> ah, that's the point
19:49 #navit: < ZeroOne01> ?!?
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19:49 #navit: < xenos1984> i guess there is really 5 min difference between them
19:50 #navit: < ZeroOne01> pc and gps?
19:50 #navit: < xenos1984> yes
19:51 #navit: < xenos1984> because arrival time calculation uses pc time, but your picture shows gps time
19:51 #navit: < ZeroOne01> and the remaining time calculation?
19:52 #navit: < xenos1984> that's only a relative timespan
19:53 #navit: < xenos1984> if i say "we arrive in one hour" this statement is independent of which clock i use
19:53 #navit: < xenos1984> it just says the remaining route takes one hour
19:53 #navit: < ZeroOne01> ok.. i'll check that.. after dinner ... will be back asap :-)
19:54 #navit: < xenos1984> have fun ;) i'll check the channel logs tomorrow, so just post your results here and i'll see them
19:54 #navit: < xenos1984> gn8!
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20:35 #navit: < ZeroOne01> xenos1984 you're right - PC-time was 5 minutes before actual time, BUT if i say we'll arrive in 1hour, this is definitly a relative time but the time of arrival correlates with the time remaining.
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--- Log closed Wed Mar 13 00:00:14 2013