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Mick_1959
Lifetime Member
Joined: Sep 24, 2007
Posts: 247
Location: Cambridgeshire
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 Posted: Tue Jan 15, 2013 1:06 pm Post subject: HD Traffic Horizon - 950 |
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I am enquiring if anyone else has anyone else experienced an increase in the HD traffic horizon of late.
I have just returned from a business trip to Redruth, Cornwall and the HD traffic on my Go Live 950 was showing incidents over 100 miles away during my trip!
The Go live 1005 belonging to my daughter I ran alongside for comparison was still limited to 40miles (I had not used the 1005 before and wanted to see how it compared).
Or was I just lucky over last 5 days
Both are fully up-to-date on navcore and maps.
_________________
Mick
Go 1005 in need of resuscitation
GO 950 Dead,
GO 920 Dead |
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MRCC
Regular Visitor
Joined: Apr 06, 2008
Posts: 82
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| Posted: Tue Jan 15, 2013 10:11 pm Post subject: |
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| its about 100miles on my 540 running v8.371 but has been for a few months, I didn't notice when it first changed. It had been down to about 60miles at one time, then 75 for a while. |
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rwbaldwin
Occasional Visitor
Joined: Dec 24, 2012
Posts: 55
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| Posted: Wed Jan 16, 2013 12:19 am Post subject: |
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I had a Go Live 1005 to play with the other day.
It seemed to download traffic data for all 93 miles of my trip when I first switched it on, but then only displayed 40+ miles of it  |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Wed Jan 16, 2013 10:54 am Post subject: |
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Which only goes to prove the stupidity of TT's policy. It does not even save data bandwidth. Download it all onto the device, then bin a load of it  |
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HenryMitchell
Regular Visitor
Joined: Jul 04, 2007
Posts: 139
Location: Godstone, Surrey
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| Posted: Thu Jan 17, 2013 8:05 am Post subject: |
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My Go 1005 seems to have two horizons now- incidents within about 100 miles or so are downloaded but only incidents within about 40 miles are displayed and taken into account for the ETA.
Interestingly, the latter is driving distance, not as the crow flies. My commute around the M25 is 50 miles long but only 27 miles direct, and incidents near the end are are never shown to start with.
_________________
Device: GO 600, Live connected via iPhone 5.
App: 13.030.1412491.111 (0) (2042, 31/10/2013)
OS: 1392579
Map: Europe v920.5244 (11/2013) |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14906
Location: Keynsham
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| Posted: Thu Jan 17, 2013 8:42 am Post subject: Re: HD Traffic Horizon - 950 |
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| Mick_1959 wrote: | I am enquiring if anyone else has anyone else experienced an increase in the HD traffic horizon of late.
I have just returned from a business trip to Redruth, Cornwall and the HD traffic on my Go Live 950 was showing incidents over 100 miles away during my trip! |
I wonder? I'll be checking more, but I think I had a better horizon going into London on Tuesday. Work hasn't picked up enough since Christmas for me to do much, time will tell (Nottingham this weekend, weather permitting).
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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falkirk81
Pocket GPS Verifier
Joined: Jul 07, 2006
Posts: 1651
Location: Newcastle, England, UK
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| Posted: Thu Jan 17, 2013 9:35 pm Post subject: |
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My GO1005 is showing roadworks on the A585 at Blackool 100 miles away from my current location of Morpeth, NE61.
Steven
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Tomtom GO 1005 LIVE
iPhone 12 |
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falkirk81
Pocket GPS Verifier
Joined: Jul 07, 2006
Posts: 1651
Location: Newcastle, England, UK
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| Posted: Thu Jan 17, 2013 9:36 pm Post subject: |
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_________________
Tomtom GO 1005 LIVE
iPhone 12 |
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matthewj
Frequent Visitor
Joined: Apr 03, 2006
Posts: 751
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| Posted: Fri Jan 18, 2013 4:07 pm Post subject: |
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Someone better at math will be able to answer this, but assuming square limits, what is the furthest you can see to the point in the corner? That is, if the range is 50 miles, then 50 miles north and 50 miles west is possible. Now, right angled triangles and pythagorus wasn't it, gives us sqrt(50x50 + 50x50) which seems to be 70 miles. Hmm, and 75 miles is 106 miles possible. 100 mile square gives 141 max distance.
Thus we have to be careful about what we are concluding. The 75 mile range allows up to 106 miles away by crow. And IIRC it is limited by km anyway, so conversion is needed.
But it does look like it is back to something better, even if they haven't announced it anywhere. So long as there is no snow anytime soon, we should be good for a while. |
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MRCC
Regular Visitor
Joined: Apr 06, 2008
Posts: 82
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| Posted: Fri Jan 18, 2013 9:33 pm Post subject: |
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| matthewj wrote: | Someone better at math will be able to answer this, but assuming square limits, what is the furthest you can see to the point in the corner? That is, if the range is 50 miles, then 50 miles north and 50 miles west is possible. Now, right angled triangles and pythagorus wasn't it, gives us sqrt(50x50 + 50x50) which seems to be 70 miles. Hmm, and 75 miles is 106 miles possible. 100 mile square gives 141 max distance.
Thus we have to be careful about what we are concluding. The 75 mile range allows up to 106 miles away by crow. And IIRC it is limited by km anyway, so conversion is needed.
But it does look like it is back to something better, even if they haven't announced it anywhere. So long as there is no snow anytime soon, we should be good for a while. |
Your maths is spot on. Mind you i always assumed the range was circular from where you are i.e. same distance in every direction. |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Sat Jan 19, 2013 12:05 am Post subject: |
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| Why would they make it square? To do that they would have to do the additional computations that you have had to do. However, if it were to be done by using lat/lon, that would make it easier' but it wouldn't be a square as' say, 1degree east/west is longer the nearer the equator you get. |
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matthewj
Frequent Visitor
Joined: Apr 03, 2006
Posts: 751
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| Posted: Mon Jan 21, 2013 10:50 am Post subject: |
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| M8TJT wrote: | | Why would they make it square? To do that they would have to do the additional computations that you have had to do. However, if it were to be done by using lat/lon, that would make it easier' but it wouldn't be a square as' say, 1degree east/west is longer the nearer the equator you get. |
First, look at the pictures that have been shown - the points are all in a square area, not a circle. As to why, it is far easier and faster to program. The code is simple:
if Abs(Point.X - CurrentLocation.X) GT 50 then
DiscardPoint;
(which is, if distance from current on X axis is over 50, then discard). No complex floating point math involved, which you want to avoid on a big list of items. Since this is a crude thing, you can do crude math too. |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14906
Location: Keynsham
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| Posted: Mon Jan 21, 2013 11:25 am Post subject: |
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My Nottingham trip proved nothing - the roads were virtually empty due no doubt to everybody deciding they wouldn't go out in the horrid weather, so there was no traffic to report.
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Mon Jan 21, 2013 11:52 am Post subject: |
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| matthewj wrote: | if Abs(Point.X - CurrentLocation.X) GT 50 then
DiscardPoint; |
But that would describe a circle, which is exactly the point that I was making about a square. You need to bring root2, and/or Cos into the equation for a square and dont forget we live on a sphereoid not a flat earth  |
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DennisN
Tired Old Man
Joined: Feb 27, 2006
Posts: 14906
Location: Keynsham
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| Posted: Mon Jan 21, 2013 11:59 am Post subject: |
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| M8TJT wrote: | | and dont forget we live on a sphereoid not a flat earth |
Kindly speak for yourself only! 
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Dennis
If it tastes good - it's fattening.
Two of them are obesiting!! |
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