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jodyberry
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Joined: Dec 30, 2006
Posts: 12
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 Posted: Sun Jan 14, 2007 10:41 pm Post subject: How Does i3 Estimate Arrival Time? |
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When I select a location to navigate, my i3 shows approximate time of arrival at that location.
Does it constantly check vehicle speed versus distance to come up with the result? Because how can it guess the time so accurately whether I'm on a freeway or side streets? Does it take into account how fast I'm driving?
Thanks,
Bill |
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Lester_Burnham
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Joined: Oct 17, 2005
Posts: 618
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| Posted: Mon Jan 15, 2007 12:45 pm Post subject: Re: How Does i3 Estimate Arrival Time? |
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| jodyberry wrote: | When I select a location to navigate, my i3 shows approximate time of arrival at that location.
Does it constantly check vehicle speed versus distance to come up with the result? Because how can it guess the time so accurately whether I'm on a freeway or side streets? Does it take into account how fast I'm driving?
Thanks,
Bill |
It uses the class of road (from the mapping) and the vehicle selection you've used, and makes some assumptions about the type of vehicle, and the type of road, to calculate an average for the types of roads, over the journey.
Of course, if during your journey, you are delayed or drive notably quicker or slower than would be normal, the ETA is altered accordingly.
I don't believe it does anything pre-emptively or historically about this, though - I don't buy that the i3 has the processing power or storage for that sort of thing. |
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MaFt
Pocket GPS Staff
Joined: Aug 31, 2005
Posts: 15317
Location: Bradford, West Yorkshire
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| Posted: Mon Jan 15, 2007 6:14 pm Post subject: Re: How Does i3 Estimate Arrival Time? |
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| Lester_Burnham wrote: |
I don't believe it does anything pre-emptively or historically about this, though - I don't buy that the i3 has the processing power or storage for that sort of thing. |
however, jerry, you will find some that say the i3 DOES do this however, to avoid repeating an old discussion we WILL NOT discuss that here ;)
MaFt |
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Lester_Burnham
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Joined: Oct 17, 2005
Posts: 618
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| Posted: Mon Jan 15, 2007 6:43 pm Post subject: Re: How Does i3 Estimate Arrival Time? |
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| MaFt wrote: | | Lester_Burnham wrote: |
I don't believe it does anything pre-emptively or historically about this, though - I don't buy that the i3 has the processing power or storage for that sort of thing. |
however, jerry, you will find some that say the i3 DOES do this however, to avoid repeating an old discussion we WILL NOT discuss that here ;)
MaFt |
I believe Garmin have been pretty categoric about it... |
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snowboardcriminal
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Joined: Sep 05, 2006
Posts: 55
Location: East Bristol
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| Posted: Mon Jan 15, 2007 9:36 pm Post subject: |
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it can be sppokily accurate though, like only 2 mins out over a 4 hour journey 
_________________
Don't eat yellow snow
i3, on the middle of the dash, works just fine!
There are things that I know and you don't know, there are things that you know that i don't know, but always remember there is much that we both don't know. |
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sunstrip_steve
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Joined: Mar 12, 2006
Posts: 126
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| Posted: Mon Jan 15, 2007 10:46 pm Post subject: |
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| snowboardcriminal wrote: | | it can be sppokily accurate though, like only 2 mins out over a 4 hour journey |
Depends on how fast you drive really. On motorways its good, on A roads it thinks you are only meant to be doing 45 average. |
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jodyberry
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Joined: Dec 30, 2006
Posts: 12
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| Posted: Tue Jan 16, 2007 1:55 am Post subject: |
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| snowboardcriminal wrote: | | it can be sppokily accurate though, like only 2 mins out over a 4 hour journey |
Yes, my thoughts exactly!!
It IS pretty darn accurate, no matter HOW it does it! |
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PaulB2005
Pocket GPS Moderator
Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Tue Jan 16, 2007 9:44 am Post subject: |
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| Quote: | | I believe Garmin have been pretty categoric about it... |
Which means nothing really. Garmin still refuse to acknowledge a problem with the 2.82 firmwares onwards when loaded with many POIs despite many people here telling them about it. |
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Lester_Burnham
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Joined: Oct 17, 2005
Posts: 618
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| Posted: Tue Jan 16, 2007 10:03 am Post subject: |
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| PaulB2005 wrote: | | Quote: | | I believe Garmin have been pretty categoric about it... |
Which means nothing really. Garmin still refuse to acknowledge a problem with the 2.82 firmwares onwards when loaded with many POIs despite many people here telling them about it. |
Well there's one thing about admitting faults - either because they don't want to publically acknowledge it - or perhaps don't understand it - or perhaps even don't fully believe it.
But it's another thing entirely regarding the capabilities of a unit - if you can't accept that Garmin understand and can be authoritative about what their various units are capable of, then who's authoritative take would be good enough? Anecdotal accounts that could simply be based around inconsistencies? |
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PaulB2005
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Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Tue Jan 16, 2007 12:37 pm Post subject: |
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| Lester_Burnham - You are right of course. It was supposed to be a bit tongue in cheek because I'm sure responses from Garmin on this very subject have been posted before. One was confirming that the i3 works one way and the other that it's definitely doesn't..... |
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Lester_Burnham
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Joined: Oct 17, 2005
Posts: 618
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| Posted: Tue Jan 16, 2007 1:37 pm Post subject: |
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| PaulB2005 wrote: | | Lester_Burnham - You are right of course. It was supposed to be a bit tongue in cheek because I'm sure responses from Garmin on this very subject have been posted before. One was confirming that the i3 works one way and the other that it's definitely doesn't..... |
I don't recall Garmin contradicting themselves over this, or other statements regarding how their devices work.
I think it boiled down to Garmin being quite categoric, and users rejecting that because it didn't gel with their experience. However, their experience could simply be based on favourable inconsistencies or coincidences.
I'm not sure Garmin have appeared inconsistent on the function of their devices - they may have over faults and patches, but that may be an accountablility / damage limitation thing - but from what I've read, they've always been rather firm and consistent regarding how their devices work. |
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Paddywack
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Joined: Aug 09, 2006
Posts: 57
Location: Dublin, Ireland
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| Posted: Tue Jan 16, 2007 7:37 pm Post subject: |
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I was browsing through MapSource and came across the following average speeds for American road types:
Interstate = 67 mph
Major Highway = 58 mph
Other Highway = 45 mph
Collector Roads = 35 mph
Residential Streets = 25 mph
I would assume that a Garmin unit uses something similar to calculate routes and continously update estimated arrival times.
I have been regularly travelling on a route that has been upgraded but not updated on my garmin unit. I consistently improve on my original estimated time of arrival. More often than not however traffic pushes back the estimated arrival time on other routes. |
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PaulB2005
Pocket GPS Moderator
Joined: Jan 04, 2006
Posts: 9323
Location: Durham, UK
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| Posted: Tue Jan 16, 2007 8:11 pm Post subject: |
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Lester_Burnham
Sorry - ignore me. Bad mood....
You're right. |
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