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Aug 24th, 2023
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Joined: Jan 2011
Posts: 5,366 Likes: 15
Charter Member
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Charter Member
Joined: Jan 2011
Posts: 5,366 Likes: 15 |
I have had to re learn the old skill of knowing your road speed by looking at the rev. counter as with the half tonneau on, the speedo is not really visible. I much prefer the "proper " layout that I had on my 2009 +4.
Here for a good time not a long time!!
Reg
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Joined: Sep 2014
Posts: 2,308
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,308 |
I too found it awkward at times to read speedo with tonneau fitted so I got this Heads Up Display GPS speedometer from Amazon for £35 . It does many things but I use it mainly for clear speed accurate reading....great item.  Be aware this item lets out a very loud beep after 1 hour of driving which is to stop you nodding off at the wheel!!! Scared the c**p out of me..thought I had engine fault!!! All revealed if you read the instructions...but who does that !!!
" I LOVE THE SOUND OF THROTTLE BODIES IN THE MORNING " (ROBERT DUVAL IN "APOCOLYPSE NOW " )
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Joined: Jul 2007
Posts: 28,428 Likes: 180
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,428 Likes: 180 |
I have exactly the same in my 4/4 
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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Joined: Apr 2017
Posts: 1,799 Likes: 3
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Apr 2017
Posts: 1,799 Likes: 3 |
I too found it awkward at times to read speedo with tonneau fitted so I got this Heads Up Display GPS speedometer from Amazon for £35 . It does many things but I use it mainly for clear speed accurate reading....great item. Be aware this item lets out a very loud beep after 1 hour of driving which is to stop you nodding off at the wheel!!! Scared the c**p out of me..thought I had engine fault!!! All revealed if you read the instructions...but who does that !!! Don't be fooled into thinking that GPS always gives an accurate speed readout in a car. It will be accurate on the straight and level but less accurate on hilly and twisty roads. Not with all GPS but many don't take height change in to account when calculating the speed. Think basic trigonometry.
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Jul 2007
Posts: 28,428 Likes: 180
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,428 Likes: 180 |
Well aware of that Bob. However, it is a darn site more accurate and stable than the analogue gauge as fitted to my car (and a lot cheaper than having that gauge refurbished ).
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'09 Gen2 MINI Cooper ragtop
'90 LR 90 SW
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Joined: Apr 2008
Posts: 11,868 Likes: 138
Scruffy Oik Member of the Inner Circle
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Scruffy Oik Member of the Inner Circle
Joined: Apr 2008
Posts: 11,868 Likes: 138 |
Don't be fooled into thinking that GPS always gives an accurate speed readout in a car.
It will be accurate on the straight and level but less accurate on hilly and twisty roads.
Not with all GPS but many don't take height change in to account when calculating the speed.
Think basic trigonometry.
Hmm. The Earth is comparatively smoother than a billiard ball, altitude change is not really a consideration. GPS gives an RMC message at least every second, often more frequently. RMC (Recommended Minimum Content) message is the one that's got Latitude, Longitude, and ground speed in knots and thus is the easiest message for readouts to process, so a cheapo GPS will look just for these. Given that the ground speed of a car is unlikely to exceed say 300Kph, then in 1/3600 of an hour one will never travel more than 100 metres. What's the steepest road one would ever be likely to drive up? 1:4 / 25%? So an adjacent side of 100m and an opposite side of 25m gives a hypotenuse of 103m So if even at the most extreme situation one could possibly imagine (screaming up a 1 in 4 hill at over 180mph) the GPS speed is only likely to be 3% out - well within the legal range. In all other situations it will give very accurate results. BTW, if anyone wants the Python code to turn a Raspberry Pi into a GPS data logger, gissa shout. I'm working on it at the moment.
Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE
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Joined: Apr 2014
Posts: 6,829 Likes: 59
Talk Morgan Sage
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Talk Morgan Sage
Joined: Apr 2014
Posts: 6,829 Likes: 59 |
BTW, if anyone wants the Python code to turn a Raspberry Pi into a GPS data logger, gissa shout. I'm working on it at the moment. Oh, I'm a data logger, I'm OK, I sleep all night and I work all day. I rush up steep slopes at 200 you see, And have Raspberry Pi for tea.
Last edited by BobtheTrain; 16/09/18 04:22 PM.
Best Regards
Lang may yer lum reek
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Joined: Apr 2017
Posts: 1,799 Likes: 3
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Apr 2017
Posts: 1,799 Likes: 3 |
Don't be fooled into thinking that GPS always gives an accurate speed readout in a car.
It will be accurate on the straight and level but less accurate on hilly and twisty roads.
Not with all GPS but many don't take height change in to account when calculating the speed.
Think basic trigonometry.
Hmm. The Earth is comparatively smoother than a billiard ball, altitude change is not really a consideration. GPS gives an RMC message at least every second, often more frequently. RMC (Recommended Minimum Content) message is the one that's got Latitude, Longitude, and ground speed in knots and thus is the easiest message for readouts to process, so a cheapo GPS will look just for these. Given that the ground speed of a car is unlikely to exceed say 300Kph, then in 1/3600 of an hour one will never travel more than 100 metres. What's the steepest road one would ever be likely to drive up? 1:4 / 25%? So an adjacent side of 100m and an opposite side of 25m gives a hypotenuse of 103m So if even at the most extreme situation one could possibly imagine (screaming up a 1 in 4 hill at over 180mph) the GPS speed is only likely to be 3% out - well within the legal range. In all other situations it will give very accurate results. BTW, if anyone wants the Python code to turn a Raspberry Pi into a GPS data logger, gissa shout. I'm working on it at the moment. You're right, the theory is there but in all practical terms the GPS will be fine. Should have done the trig calc before posting. Unless of course the US Military switch off the GPS, or do we use our own satellites these days?
Bob
2009 Black Roadster
1999 4/4 2 litre Zetec
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Joined: Sep 2014
Posts: 2,308
Talk Morgan Expert
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Talk Morgan Expert
Joined: Sep 2014
Posts: 2,308 |
Phew that's a relief Bob !!!!
" I LOVE THE SOUND OF THROTTLE BODIES IN THE MORNING " (ROBERT DUVAL IN "APOCOLYPSE NOW " )
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Joined: Dec 2009
Posts: 35,790 Likes: 471
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 35,790 Likes: 471 |
Don't be fooled into thinking that GPS always gives an accurate speed readout in a car.
It will be accurate on the straight and level but less accurate on hilly and twisty roads.
Not with all GPS but many don't take height change in to account when calculating the speed.
Think basic trigonometry.
Hmm. The Earth is comparatively smoother than a billiard ball, altitude change is not really a consideration. GPS gives an RMC message at least every second, often more frequently. RMC (Recommended Minimum Content) message is the one that's got Latitude, Longitude, and ground speed in knots and thus is the easiest message for readouts to process, so a cheapo GPS will look just for these. Given that the ground speed of a car is unlikely to exceed say 300Kph, then in 1/3600 of an hour one will never travel more than 100 metres. What's the steepest road one would ever be likely to drive up? 1:4 / 25%? So an adjacent side of 100m and an opposite side of 25m gives a hypotenuse of 103m So if even at the most extreme situation one could possibly imagine (screaming up a 1 in 4 hill at over 180mph) the GPS speed is only likely to be 3% out - well within the legal range. In all other situations it will give very accurate results. BTW, if anyone wants the Python code to turn a Raspberry Pi into a GPS data logger, gissa shout. I'm working on it at the moment. You're right, the theory is there but in all practical terms the GPS will be fine. Should have done the trig calc before posting. Unless of course the US Military switch off the GPS, or do we use our own satellites these days? People get carried away about accuracy these days, just open a discussion about the "ovality of error" involving GPS for a really involved discussion..  I was unfortunate enough to be involved in some early GPS evaluation trials checking and calibrating it.
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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