How accurate is the mph reading?

ClockworkCar · Occasional Visitor Joined: Jul 02, 2005 Posts: 16

Just how accurate is the mph speed reading generated by TTM? Is the accuarcy effected by type of receiver used (I'm using a BT77) or coverage?

I know very few car speedo's are 100% accurate, but sometimes the difference in readings can be as much as 10mph. At other times is seems quite spot on.

Thanks.

Roberto · Occasional Visitor Joined: Jun 26, 2005 Posts: 36

Your GPS speed reading is likely to be more accurate than your car speedo which is likely to be out by +/-10%.

futuresbright · Posted: Tue Jul 26, 2005 9:34 pm Post subject:

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.

-Bazza- · Occasional Visitor Joined: May 28, 2005 Posts: 50

Tomtom's speed is usually about 5mph slower than my car speedo, so my speedo probably shows the speed as 5mph faster that it actually is.

It's no wonder I've never had a speedy ticket. Laughing

_________________
Nokia 6600 running TT Mobile 5.0

Pocketgps · Posted: Tue Jul 26, 2005 10:24 pm Post subject:

The UK requires a speedo to be accurate or 'fast' -0%, +10% at 30 mph.

bounty · Posted: Wed Jul 27, 2005 12:16 pm Post subject:

My car has an LCD speedo display - the TT measurement mirrors it almost exactly.

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