html5 watchposition inconsistent result

Hi,


I want to track my vehicles as well as I want to calculate odometer using web browser which supports html5, I am using watchposition() then I found following results

I am having following devices
Device 1   :  Samsung gt p5113
Device 2   :  HTC 1 mini

to get internet I used hotspot for Samsung gt p5113  as there is no SIM facility available with this tablet and WIFI is not available at my place.

Then I found following result

HTC 1 mini  :   gives accurate result for odometer when I traveled 25 miles
Samsung gt p5113 : there was always inaccuracy in odometer reading

I would appreciate if any one can suggest other way for achieving same goal or reason for above inaccuracy.


Thank you
shahjagatAsked:
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Scott FellDeveloper & EE ModeratorCommented:
Are you using the exact same service for Cell, internet connection and gps?  I think sometimes the service guesses your location.
shahjagatAuthor Commented:
Scott Fell

Thanks for reply, but I have not understood your comment, can you please elaborate.
Scott FellDeveloper & EE ModeratorCommented:
I believe sometimes the location is based on the cell tower and GPS where the samsung only has wifi so it will not be as accurate. http://www.samsung.com/us/mobile/galaxy-tab/GT-P5113TSYXAR-specs   The HTC has Internal GPS antenna + GLONASS
Digital compass  http://www.htc.com/www/smartphones/htc-one-mini/#/

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shahjagatAuthor Commented:
Thanks a lot Scott Fell,

Now I facing one more issue, When I am driving my browser shows good GPS reading for
Latitude, Longitude Timestamp and Speed.

but when I stop Speed does not becomes zero even.

Can any one please suggest me the reason behind it, because I want to show important message like "Vehicle in Motion You cannot operate tablet while driving" based on this speed parameter,
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