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We had a NIGHTMARE with these sat navs to put it mildly in France so much so Alan gave up and used his tomtom which I have to add still didn't have us going the same way and led to even greater problems...Truck route v car route.Hi Sandra don't know why the times vary so much but if I'm getting it right then the milage for the various routes are very similar and both routes look very similar on the screen shot. .
To me the times are a bit academic ..
My gamin and Chinese unit frequently choose different routes both have same vehicle dimensions and usually have to say I think the Chinese unit chooses best...
Well I've fallen into the trap of just going with the sat nav after sometimes checking it's chosen route with a map...We had a NIGHTMARE with these sat navs to put it mildly in France so much so Alan gave up and used his tomtom which I have to add still didn't have us going the same way and led to even greater problems...Truck route v car route.
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Both the exact same.one has the speed limits set for hgv's the other not?
Why? Basic principle - same software, same data, same result.If they are from different manufactures then it would be extremely surprising if they chose the same route!
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Graham surely the results arnt that different in Sandras original screen shot of the sat navs chosen route.. The milage are the same near enough it's only the estimated times for the journey that are significantly different..Why? Basic principle - same software, same data, same result.
The hardware shouldn't make a difference of the type under discussion. There has to be some difference in the software or the data to produce different results.
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As Jock & The Big1 have said, if the software is the same there must be differences in the data in some way(s). As I've posted on previous threads, the iGo software does sometimes over-ride input parameters with system standards. For instance, avoiding a road with a 7.5 tonne limit even though the vehicle weight input is 3.5 tonnes - i.e. it assumes that any vehicle with a Lorry profile will be over the limit.Graham surely the results arnt that different in Sandras original screen shot of the sat navs chosen route.. The milage are the same near enough it's only the estimated times for the journey that are significantly different..
Andy.
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The software I work with does route scheduling. We can be working with many thousands of trips at a time. Running the same trips through the algorythm repeatedly can give different results but only if something has changed causing database sorting to produce differing results.The algorithms that are doing the calculation are very complex. It may well be that the order that the various calculations are carried out in is varied as you change the settings.
I use copilot on my phone. One of the options is whether or not to use active routes. If you calculate a route with active routes turned off, then turn active routes on and allow it to recalculate, and then turn active routes back off again and recalculate, the time of arrival will be different for the 2 active routes off scenarios.
When you think how many variables the system is having to consider, and the number of various settings we can play around with, it's no great surprise that variations can creep in.
I use both tom-tom and copilot and prefer the copilot.
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