Increase Accuracy level of a given Latitude and Longitude

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Google-Maps

GPS

I'm new in google map application and using google maps API for getting my current latitude,longitude using geolocation (navigator.geolocation.getCurrentPosition) service. I'm getting the latitude & longitude and it seems that coordinates is not correct. I've tried to get accuracy through gelocation service and found that accuracy is 800+ meter, but I think, if accuracy is less or equal to 30 meter then we can consider that coordinates. I'm using this geolocation service in JavaScript for my ASP .Net application.

Can anybody help me get my current position? I would like to have my current position in google maps with accuracy level within 25 meter.