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-   -   Sat nav or car most reliable (http://forums.sv650.org/showthread.php?t=128697)

Messie 30-03-09 11:04 AM
Sat nav or car most reliable
 
Which one's MPH should I trust.

On my way into work this morning in my new car I noticed that when the car odometer read 62 the sat nav read 58.
i would've been happy to accept that sat nav's have superior technology and trust that reading more, however...

crawling along in a queue the car read 3 MPH and the Sat Nav said 0MPH!

Which one do I believe?

Holdup 30-03-09 11:06 AM
Re: Sat nav or car most reliable
 
I always believe my car they do say there can be a 10% difference in speed reading, i got a gps camera device which shows me doin 2 mph less than what my car says

svdemon 30-03-09 11:08 AM
Re: Sat nav or car most reliable
 
I would tend to believe the sat nav more, perhaps it doesn't bother reading under 5/10 mph?

Ceri JC 30-03-09 11:13 AM
Re: Sat nav or car most reliable
 
On a straight section of road the GPS will be more accurate, IMO. They don't seem to overread to the same extent as in car ones (if at all).

richie95 30-03-09 11:16 AM
Re: Sat nav or car most reliable
 
gps... has a few miles under car... i heard somewhere that the speedo on cars are out as a deterent to speeding, by a percentage, so you think your doing 70 its actually 65... maybe just another motorised myth...

jimmy__riddle 30-03-09 11:32 AM
Re: Sat nav or car most reliable
 
Quote:
Originally Posted by richie95 (Post 1843009)
gps... has a few miles under car... i heard somewhere that the speedo on cars are out as a deterent to speeding, by a percentage, so you think your doing 70 its actually 65... maybe just another motorised myth...
i dont think its a deterrent to speeding, but more or a liability thing for the manufacturer. it you went past a speed camera at an indicated 30 and got a ticket cos you was doing 32 you would be a little annoyed. they make them over read so that doesnt happen, and they allow for manufacturing tollerances.

As for GPS, do they take vertical change into consideration? i.e. actual distance travelled or distance in X Y only?

punyXpress 30-03-09 01:28 PM
Re: Sat nav or car most reliable
 
Ever since my Garmin claimed I was walking at 19 mph I've had my doubts.
I'm so slow I'm into third by then !

Messie 30-03-09 06:14 PM
Re: Sat nav or car most reliable
 
Oh I was hoping for some knowledge here.

i have an opinion lol

punyXpress 30-03-09 08:43 PM
Re: Sat nav or car most reliable
 
A..B..C.................D..E..F
Satnav has a ( small ) margin of error
To measure B to E above, you would be OK with A to D, B to E, & C To F
BUT A to F would read high & give fast reading & C to D the opposite.

Messie 30-03-09 08:46 PM
Re: Sat nav or car most reliable
 
Quote:
Originally Posted by punyXpress (Post 1844351)
A..B..C.................D..E..F
Satnav has a ( small ) margin of error
To measure B to E above, you would be OK with A to D, B to E, & C To F
BUT A to F would read high & give fast reading & C to D the opposite.
Ow that hurts!


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