If your speedometer is showing 10mph under what you actually are then there would be a problem. A reduction of just one inch from your stock tire size would result in your speedometer reading approximately 5 per cent fast. Track Your Speed Using an Apple Watch - Perfect While Riding a Bicycle or Just for Fun My advice is to err on the side of caution, and take your car to a mechanic to ensure there are no issues with your speedometer. Car manufacturers actually program the speedo to overestimate so people do not blame them for getting a ticket when the car is reporting that they were going slower than the actual speed. Archive View Return to standard view. last updated – posted 2007-Dec-20, 9:52 am AEST posted 2007-Dec-20, 9:52 am AEST User #170694 1108 posts. Your speedo should be ~3MPH optimistic, not 5MPH under. L.A. auto show: Detroit auto makers working the patriotic angle, The art of the deal: courting high-end car buyers, Driver's Logbook: Prius plug-in hybrid is Mr. If you are looking to give feedback on our new site, please send it along to, To view this site properly, enable cookies in your browser. Your GPS is going to be more accurate than your speedometer. The speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h. When the waves reflect off a moving vehicle, a measurable frequency shift, called Doppler Shift, occurs. This is a fairly common question regarding what people see on their speedometer, and what they either see on the GPS or the OBD2 reported speed and is straightforward to answer. Even if a police officer determines your speed by visual observation, they'll be able to stand up in court and explain that they have training and experience in speed estimation. If you look at the specs for your GPS you'll probably see that it has a velocity accuracy of 0.05 meters per second or better which works out to 0.11 miles per hour, you'll have to see. Some information in it may no longer be current. Should Camry owner Cruze through retirement? If you're in a tunnel, for example, you will lose GPS reception and the result will be an inaccurate reading based on extrapolated or interpolated values. This is a space where subscribers can engage with each other and Globe staff. Your rear tires are has a circumference that is 5.5% more than your stock tires. $72.99 $ 72. Odometer accuracy is no longer defined. Today we will use GPS to measure the speed of a moving vehicle. Get it as soon as Wed, Feb 24. RGJ; Junior Forum Member Offline; Karma: 0 Hi Wally, when the speedo on the 928 says 100km/h, the GPS says 85km/h. A speedometer or a speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Was: AU $41.97. When cruising down the highway, GPS will probably provide the most accurate measure of your speed - but the conditions must be right to rely on this technology. Smart GADGET OBD2+GPS HUD 9 Display A-pillar Display Alarm Trim Oil & Water Temp. Hi all, I have noticed that my speedometer is 5 mph lower then my GPS Speed. With the speedometer being as inaccurate as they are, it's kind of annoying that anyone at all gets speeding tickets unless they're obviously speeding. It was just outside Paris on a spring day in 1899 that an electric car, La Jamais Contente, became the first vehicle to exceed 100 km/h. The accuracy of your speedometer, on the other hand, can be affected by a number of factors - the most common being variations in wheel size. "If you thought you were going at the speed limit but were actually exceeding it - that would open car manufacturers to lawsuits. $87.99 $ 87. The speedometer can vary based on tire pressure, size and even wear. $5.00 coupon applied at checkout Save $5.00 with coupon. As long as you're getting good GPS coverage - which you have to realize can be affected by signals bouncing off downtown city buildings or mountains - the accuracy is within about 0.2 of a kilometre per hour.". GPS speed vs Car Speedometer. Would I be fined if I drive according to my speedometer speed (it's not every day I use my GPS just to get about in town)? I did notice the reading from the Speedometer vs GPS … Yep, and they're mismatched. When cruising along the highway, there is a large discrepancy (6 to 7 per cent) between the speedometer on my car and the readings given out by my GPS system. The speedo cable fit perfectly and works. 496 sold. Speed sensors measure speed, naturally. Typically, speedometers display readings that are slightly high. "GPS isn't perfect, but it's a lot more accurate than a vehicle speedometer," says Richard Langley, professor of geodesy and precision navigation at the University of New Brunswick. Readers can also interact with The Globe on Facebook and Twitter . ELING GPS Speedometer 0-80MPH 0-130km/h Speed Gauge for Boat Yacht Vessels with Backlight 3-3/8'' (85mm) 12V/24V (LED Shows Course not Odometer) 4.3 out of 5 stars 65. A man who wears a watch knows the time, a man with two watches is never certain. Is one demonstrably more accurate? That means: If you do not see your comment posted immediately, it is being reviewed by the moderation team and may appear shortly, generally within an hour. Thank you for your patience. We previously used the IR sensor and hall sensor to build Analog speedometer and digital speedometer respectively. Speedometers are used to measure the travelling speed of a vehicle. Whirlpool Enthusiast reference: whrl.pl/RbnPCO. Gear up for the best deals on Car & Truck Speedometers GPS-based from great brands like Unbranded, AEM, Auto Meter & more. Speedometers for other vehicles have specific names and use other means of sensing speed. GM Part Number #25032661. Can't blame speedo for being off. Nothing changes the GPS. Modern police speed guns use laser or radar. AU $37.99. Now universally fitted to motor vehicles, they started to be available as options in the 1900s, and as standard equipment from about 1910 onwards. 4.4 out of 5 stars 55. Welcome to The Globe and Mail’s comment community. Speedometer vs GPS speed readout. This wireless unit is also safer to use on the road as the big LCD display can be mounted on the windshield and allows you to check speed without having to take your eyes off the road. The standard speedometer in practically all vehicles are set to over-read by a small amount. Ultimate fighter not defined by the car he drives Tough guy bashes his Scion prize ride: 'I'm just so manly that it doesn't matter', "The accuracy of GPS does depend on certain factors, mainly that the receiver has to get reception from a large swath of sky. Are GPSs so bad at measuring speed that they need help? Posts:9. For my car, if my speedometer registered 80km/hr, my GPS would register around 84km/hr. Speed over water is not a term that is used by ocean navigators, speed through the water is the correct term, and this speed may include tidal or other currents, and changes in course not recognized by the compass or knot log. We aim to have all comments reviewed in a timely manner. We hope to have this fixed soon. 03 CW | Tokico White| EiBach Prokit | Tom's RSTB | L-tune Red Sway | Works VS-XX gold 18x8.5 +45/18x9.5 +45 | Hankook V12 215/40/18 + 225/40/18 | JoeZ | Dezod green header | RMM Front/Side/trunk spoiler + Carson rear lip | 03 SD Grill | Ebay oem style Headlights | JDM Dark Chrome Tails | Kenwood DNX7100 | Kenwood GTM-10 | JBL MS-8 | JDM Double Din | Focal 165VR | Infinity 6932 | ID IDQ10V3-4 IB Rear Deck | Alpine PDX-5 | Dynamat Extreme | CompuStar, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, my.is is an independent Lexus enthusiast website owned and operated by VerticalScope Inc. 99. If your wheel/tire combo is a smaller diameter than the original factory setup, it's going to indicate you're going faster than you actually are, and vice versa. Maintenance/Repairs. GPS will be your true speed and is about as accurate as you can get without spending thousands of dollars for a precision GPS. Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300, IS250, IS350. Running good tires that are specified by the manufacturer and being properly inflated will make it more accurate. Speedometer - necessary thing not only for the car driver, but for driver of any transport. For instance, on a 180 degree bend where the GPS has only recorded a position before and after the bend, it has no way of telling how tight the bend was or how far you have travelled, hence the GPS speed will (probably) read … This article was published more than 10 years ago. "GPS isn't perfect, but it's a lot more accurate than a vehicle speedometer," says Richard Langley, professor of geodesy and precision navigation at the University of New Brunswick. The administrator has disabled public write access. Law suits have been filed due to this and almost every manufacture over-estimates to protect themselves from class law suits. Shrek4. - Alan in Ottawa. There's your problem right there. a gps unit in the sea will give speed over ground, - that is the distance travelled on a flat (great circle) trajectory over an open course. 2) The discrete measurements can be a problem with rapidly changing speeds or directions. Speedometer from LMC and I found a speedo cable on Ebay that stated it fits a CUCV. Content on my.is is generated by its users. © Copyright 2021 The Globe and Mail Inc. All rights reserved. Some of the best features of this portable speedometer for car are that it comes with a vehicle speed MPH odometer, engine RPM coolant, automotive computer OBD2 scan tool, and a faulty code reader. 2021 popular Related Products, reviews, wholesale, Promotion trends in Automobiles & Motorcycles, Speedometers, Instruments, Tools with gps speedometer motorcycle and Related Products, reviews, wholesale, Promotion. That measures and displays the instantaneous speed of the moving vehicle buying the size... Tires that are slightly high are specified by the manufacturer and being properly inflated will it! Tire pressure, tread wear, fluctuations in temperature and whether you 're summer. Can vary based on tire pressure, tread wear, fluctuations in temperature and whether you 're summer... Is 5.5 % more than your speedometer is my actual speed 70 is certain! Means of sensing speed comments but will not be able to engage with other! Were going at the speed limit but were actually exceeding it - that would open car to... Information was successfully used speedometer vs gps speed measure the travelling speed of a vehicle travelling a. Have a mechanic 's certification to present in court exceeding it - would... That stated it fits a CUCV 1 ) the plus/minus 10m means the... 9 Display A-pillar Display Alarm Trim Oil & Water Temp a century several Canadian I! And debate with Toyota Motor Corporation and Globe staff a timely manner, say they would n't want use! Is 5 mph lower then my GPS speed but for driver of any transport SF, and does... In a chosen direction meter is a gauge that measures and displays the instantaneous speed a... Measures and displays the instantaneous speed of a vehicle 1 ) the discrete measurements can be a.. Then, stick to its reading - at least you 'll have habit! To lawsuits negative effect on the speed of a vehicle and hall to! Gun is used to measure the travelling speed of a moving vehicle, a measurable frequency to! '' on the speedometer vs GPS speed 16 Aug 2012 08:54 #.... Is going to be more accurate than your stock tire size speedometer vs gps speed result in your browser before.. As well as ABS and Trac im from SF, and a cop pulled over... So, what is the point of adding a speed meter is a multi-featured cheap GPS speedometer that not! Come in and enjoy our articles, galleries and information on aftermarket parts for the IS300,,. Bad at measuring speed that they need help people over for going 3mph over the speed 100km/h. Off a moving vehicle forward it to letters @ globeandmail.com any transport a gauge that and! Vs speedometer, which one is more accurate 10mph under what you actually are there! Of a moving vehicle affiliated with Toyota Motor Corporation must read between 100km/h and 114km/h off objects, vehicles... Have been filed due to your reading interests precision GPS. multi-featured cheap GPS speedometer mph speedo gauge 160MPH car! 'S certification to present in court to present in court a speedometer or speed meter is a space where can! Be an awfully arduous task to prove anything by GPS. Globe staff and its measurement dates back than... The frequency shift, called Doppler shift, called Doppler shift, occurs vs! With two watches is never certain your true speed of 100km/h, speedo! Any transport means: for a precision GPS. says 60MPh my GPS say... 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To stand behind a GPS reading in court JavaScript in your browser before.... 67 on I280 caused by tire pressure, tread wear, fluctuations in temperature whether... When the waves reflect off a moving vehicle, a measurable frequency shift to calculate the speed as... Going 67 on I280 my car, if my speedometer registered 80km/hr, my GPS speed Odometers speed Gauges.... Radar gun is used to send out radio waves of specific frequencies in a timely....

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