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Paula
December 4, 2017, 11:24am Report to Moderator

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It's also good to know that your Sat Nav is likely to be more accurate on a straight and level road.
Quite obvious when you think about it, but i hadn't.

Simple article here https://www.driving.co.uk/car-clinic/car-clinic-which-should-i-trust-my-speedometer-or-my-sat-nav/


Vitesse 6 Saloon  "Feargal" (Sharkey)
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JohnD
December 4, 2017, 6:50pm Report to Moderator


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Straight - yes.   The satnav doesn't know you are going around corners and will take the straight line distance between update points, which will be less than your actual distance and so make your speed appear slower than it is.   If you travel across a semicircle, you will have gone, say, 10 units of distance, but travelled 10 x Pi/2 units around half a circle.   So you will have gone 15.7 units in the time that SatNav thinks you have done only 10, 50% faster than SatNav thinks you have.  But few can do that in a time thar will confuse SatNav.

But Level?    They always go on about "satnav can't see slopes, so you're going further than it thinks so will calculate a higher speed"  
Few slopes that anyone will ascend by car will be more than 10%, which means that you gain 1 meter (or whatever) for every 10 that you travel on the level.
The angle between the two lines will be 5.671 degrees.

Now the ratio between the Hypoteneuse (the sloping bit) and the level is determined by the Cosine of that angle, 0.995, so that 10 units on the level will mean 10,05 on the slope, and the satNav gods will estimate that you have travelled 10 units when in fact you have done 10.05.  Your speed will be underestimated by a massive 0.005%

Hooray for Maths!  The Queen of Science!
John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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Paula
December 4, 2017, 7:06pm Report to Moderator

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Quoted from JohnD
Straight - yes.   The satnav doesn't know you are going around corners and will take the straight line distance between update points, which will be less than your actual distance and so make your speed appear slower than it is.   If you travel across a semicircle, you will have gone, say, 10 units of distance, but travelled 10 x Pi/2 units around half a circle.   So you will have gone 15.7 units in the time that SatNav thinks you have done only 10, 50% faster than SatNav thinks you have.  But few can do that in a time thar will confuse SatNav.

But Level?    They always go on about "satnav can't see slopes, so you're going further than it thinks so will calculate a higher speed"  
Few slopes that anyone will ascend by car will be more than 10%, which means that you gain 1 meter (or whatever) for every 10 that you travel on the level.
The angle between the two lines will be 5.671 degrees.

Now the ratio between the Hypoteneuse (the sloping bit) and the level is determined by the Cosine of that angle, 0.995, so that 10 units on the level will mean 10,05 on the slope, and the satNav gods will estimate that you have travelled 10 units when in fact you have done 10.05.  Your speed will be underestimated by a massive 0.005%

Hooray for Maths!  The Queen of Science!
John


Well that's that sorted then! Straight-Yes Curves-No and hills? Don't worry about it!


Vitesse 6 Saloon  "Feargal" (Sharkey)
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pimp my vit
December 4, 2017, 8:28pm Report to Moderator

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Well maths is not my subject but I know a fair bit about sat nav's and the good ones (Clarion for instance) have 3d gyroscope in them that will measure the rise and fall of the road and compensate for it.

However I don't think the average portable sat nav will have such a feature.


1967 2.0 Mk 1 Vitesse in bits since year 2000
Fortune spent and still spending
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Paula
December 4, 2017, 8:37pm Report to Moderator

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Quoted from pimp my vit
Well maths is not my subject but I know a fair bit about sat nav's and the good ones (Clarion for instance) have 3d gyroscope in them that will measure the rise and fall of the road and compensate for it.

However I don't think the average portable sat nav will have such a feature.


Or my smartphone


Vitesse 6 Saloon  "Feargal" (Sharkey)
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Pete Lewis
December 5, 2017, 8:00pm Report to Moderator

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And if all else fails there is for police to do an old fashioned time test most authorities have black and white short poles set at 1/4 mile intervals normally on straight main roads
So at 60 one post every 15 seconds  or 30s at 30
keep a lookout you may spot some
pete


1964 1600 Vitesse 6 Cactus and Black , now  sold
now have T2000   Mk2 saloon in French Blue/grey trim  been  restored without running since 1997
now has power steering ,poly bushed and Alfa 156 seats
location  Luton
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JohnD
December 5, 2017, 10:42pm Report to Moderator


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Pete, Paula,
  I've never seen those posts beside main roads.   Occasional squares of white tarmac on the surface,  that used to be for Police Vascar speed measurement calibration, before satnav and radar guns. They will be  known (to the Police) distance apart.

BUT, all motorways have white posts every 100 meters, the ones with a little phone sign and an arrow, so the broken down motorist can go the the nearest.

Get a friend to time how long you take to pass 10 of those. That's a kilometer.   If that is X minutes, then 60/X = Kilometers per hour, which Google will convert it to MPH.  And that's just arithmetic!
Drive at a constant speed while they time you!

John


Serial Vitesse racer.

Old Blue.  1995-2001
Silverback. 2001-2007
SofS. 2007 - to date.

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Casper
December 6, 2017, 8:54am Report to Moderator


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Quoted Text
They will be  known (to the Police) distance apart.

Actually, no.  Any feature, even a transient one, could be used to measure distance with Vascar (Visual Average Speed Computer And Recorder).  The time counter was triggered when the (potentially) offending vehicle passed the mark, and the distance measure was triggered when the following police vehicle passed the mark, so the distance was measured each time.  The marks you mention were used on roads where no shadows, bridges, etc. could be used.  They would be a minimum distance apart.
C.


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Rosbif
December 6, 2017, 11:21am Report to Moderator

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The way I do it is:

Circle the date on the calendar, go for a drive and then mark the date I get back. Divide the distance covered by the number of days, hey presto!  

OK so I drive slower than you lot


Ruby : 1968 13/60 convertible
"I'm not rich enough to buy cheap"

"If it isn't broken don't fix it" - where's the fun in that?
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Nick Jones
December 6, 2017, 7:15pm Report to Moderator

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Sat nav will be far more accurate that the original speedo in almost all conditions.  No need for more exotic methods.

How about the odometer though?  Does your new speedo have the same turns per mile (tpm) as the old one.  It's marked on the face, just under the trip display usually.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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Paula
December 7, 2017, 10:06pm Report to Moderator

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Quoted from Nick Jones
Sat nav will be far more accurate that the original speedo in almost all conditions.  No need for more exotic methods.

How about the odometer though?  Does your new speedo have the same turns per mile (tpm) as the old one.  It's marked on the face, just under the trip display usually.

Nick


This number?



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Vitesse 6 Saloon  "Feargal" (Sharkey)
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Nick Jones
December 7, 2017, 10:12pm Report to Moderator

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Yep.  That's the one.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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Paula
December 7, 2017, 10:14pm Report to Moderator

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Quoted from Nick Jones
Yep.  That's the one.

Nick


Woo Hoo all good!
Thanks


Vitesse 6 Saloon  "Feargal" (Sharkey)
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Paula
December 7, 2017, 10:26pm Report to Moderator

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Quoted from Pete Lewis
And if all else fails there is for police to do an old fashioned time test most authorities have black and white short poles set at 1/4 mile intervals normally on straight main roads
So at 60 one post every 15 seconds  or 30s at 30
keep a lookout you may spot some
pete


Old school!
Like it


Vitesse 6 Saloon  "Feargal" (Sharkey)
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Paula
December 7, 2017, 10:27pm Report to Moderator

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Quoted from Rosbif
The way I do it is:

Circle the date on the calendar, go for a drive and then mark the date I get back. Divide the distance covered by the number of days, hey presto!  

OK so I drive slower than you lot


Brilliant!


Vitesse 6 Saloon  "Feargal" (Sharkey)
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