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ColinBate Occasional Visitor
Joined: Aug 24, 2005 Posts: 2
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Posted: Fri Aug 26, 2005 9:30 am Post subject: Speed reading out |
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I have an Ipaq hx2110 & TT5.01 & speed is showing 4/5 miles lower than my speedo any body else seen this problem. Which is the most acurate I assume GPS would be??
Regards
Colin Bate |
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CJackel492 Regular Visitor
Joined: Mar 15, 2005 Posts: 210
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Posted: Fri Aug 26, 2005 9:40 am Post subject: Re: Speed reading out |
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ColinBate wrote: | I have an Ipaq hx2110 & TT5.01 & speed is showing 4/5 miles lower than my speedo any body else seen this problem. Which is the most acurate I assume GPS would be??
Regards
Colin Bate |
I would say that the GPS is more accurate,
Speedo's are usually not very accurate and are offen rated over, so that when you think your doing 30mph your actually doing 28mph,
No speedo on new cars is allowed to read under, otherwise it will make you speed unknowningly,
Carl, _________________ Phones - Nokia 9500 + a few others
Nokia 9500 running TTM5 |
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hyjacks Occasional Visitor
Joined: Jul 07, 2005 Posts: 29
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Posted: Fri Aug 26, 2005 9:40 am Post subject: |
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at 100 mph my speedo acording to the gps is 10 mph out. does anybody know which is the most acurate? |
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Skippy Pocket GPS Verifier
Joined: 24/06/2003 00:22:12 Posts: 2946 Location: Escaped to the Antipodies! 36.83°S 174.75°E
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Posted: Fri Aug 26, 2005 11:28 am Post subject: |
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This has been discussed many times on the forum. 8O Here's the answer:
If you are travelling at a constant speed for several seconds on a flat road and in a straight line, with a good satelite fix then the GPS will typically give a speed reading which is accurate to 0.1 MPH
If your speed is changing then the speed indicated by the GPS will lag behind reality.
If you are going around a corner or up/down hill then the GPS will read slightly slow.
A car speedo will typically read 0-10% fast to allow for manufacturing tolerances, tyre wear, different brands/types of tyre etc. _________________ Gone fishing! |
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Andyd32 Occasional Visitor
Joined: Oct 26, 2004 Posts: 29 Location: United Kingdom
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Posted: Fri Aug 26, 2005 11:56 am Post subject: |
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hyjacks wrote: | at 100 mph my speedo acording to the gps is 10 mph out. does anybody know which is the most acurate? |
Your NIP is in the post |
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futuresbright Occasional Visitor
Joined: Apr 03, 2005 Posts: 35 Location: west yorkshire
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Posted: Fri Aug 26, 2005 10:26 pm Post subject: |
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I would say that ttm speed reading is very accurate,it is your car speedo that is out.
I am saying this because i am a hgv driver and my wagon has just been in for its 2 yearly tachograph and speedo check,which by law has to be spot on.
when travelling now i cannot see any difference in the speeds shown both on the needle and display of ttm.
I am using the original ttm silver receiver. |
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BarMuda Occasional Visitor
Joined: Mar 04, 2005 Posts: 30
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Posted: Fri Aug 26, 2005 11:10 pm Post subject: |
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I have a friend in the police force and he informs me that Speedos are set at 10% less than the speed you are doing, as is quite common knowledge. |
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MrT Frequent Visitor
Joined: Nov 14, 2003 Posts: 2143 Location: Surrounded by A1, M1 & M25
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Posted: Sat Aug 27, 2005 6:59 am Post subject: |
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Speedos can be set at an error of upto 10% overreading but the overreading is only there as a tolerance of error in manufacture and it has to be so that they overead. Most quality cars will not overread by 10% with new tyres.
You also have to remember that on a car the wheel diameter will vary by 12mm between new and severly worn tyres which will effect the accuracy of speed.
I am not impressed by the size of the font of the speed reading on TT5 when compared to TT3. On TT3 without navigation the speed was the large middle font where the distance to the next junction was shown and also very large on the overspeed screen. On TT5 it is tiny and you have to concentrate rather than glance to read it. |
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brob108 Occasional Visitor
Joined: Jun 02, 2005 Posts: 36
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Posted: Sat Aug 27, 2005 12:09 pm Post subject: |
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Quote: | Quote: | I am not impressed by the size of the font of the speed reading on TT5 when compared to TT3. On TT3 without navigation the speed was the large middle font where the distance to the next junction was shown and also very large on the overspeed screen. On TT5 it is tiny and you have to concentrate rather than glance to read it. |
Mr T...have you tried TT5 in landscape mode rather than the portrait setting? The information readouts (including speed) are bigger and easier to read |
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