Team-BHP - Using a GPS Receiver in the Car

thanks man. Thats indeed a good deal. Serves me right for not doing enough research on SatGuide before plunging on to MMI.

Do let me know does SatGuide come in SD card form? And would it be compatible with the Garmin Nuvi 205W?

Quote:

Originally Posted by NetfreakBombay (Post 2046318)

Satguide maps cost 990 Rs. Garmin PND + Satguide maps is pure VFM combination.

I have started using Samsung Wave Navigator in my car. Samsung Wave comes with Route 66 Navigator. My Car is Maruti 800 and it is 100% stock and no modification made till. Speed which my GPS Device is showing and what speedometer shows has difference of 9-10KMPH.

When GPS Device show speed of 51 KMPH my car shows 60 KMPH and this difference is pertinent for all speed.

I am really confused where is the problem, whether navigator is showing incorrect speed or my car is showing incorrect speed. Can anybody faced similar issue with their Navigator?

Quote:

Originally Posted by anujmishra (Post 2052702)

This is known as Speedo Error and is a common issue in all cars - nothing to worry about. :)

Check out this wiki link: Speedometer - Wikipedia, the free encyclopedia and scroll down to the section titled 'Error' for more info.

Quote:

Originally Posted by anujmishra (Post 2052702)

When GPS Device show speed of 51 KMPH my car shows 60 KMPH and this difference is pertinent for all speed.

This difference is on a higher side, but slight variation is expected. Reason is GPS chip is read at a frequency of 2 to 5 Hz by cell phone. And it takes two readings to calculate speed.

So, whatever speed is shown on GPS would be stale by a second or so. Unless car is running at a constant speed, speed as measured by GPS would be different.

Quote:

Originally Posted by anekho (Post 2052719)

This is known as Speedo Error and is a common issue in all cars - nothing to worry about. :)

But how come error is coming even my Tires are Stock. But Odometer measures correct distances. I have verified distance with three vehicles.

Quote:

Originally Posted by NetfreakBombay (Post 2053022)

So, whatever speed is shown on GPS would be stale by a second or so. Unless car is running at a constant speed, speed as measured by GPS would be different.

Difference is constant of 9 Kmph for all speeds. I will check speed of my GPS speed in another car and will check what is the difference coming out.

I have Garmin Nuvi 715 with Pre-installed maps for Gulf Countries.

On my recent visit to India, I got Micro SD Card (within SD Card Adaptor) installed which claims Maps for about 680 Cities in India. It costed me Rs. 2000.00.

Worked fine in Delhi, Punjab and Mumbai.
I also have Nokia Navigaor 6110 and would like to know, if it would work on it also or would it need any further / different download ?
To be honest, I did not try it out.

Please advise

Regards

Amrik Singh

I am currently using gpsed in my nokia n82 to log the route i traveled.
These routes can be saved in gpx and kml file....so is there any mobile gps navigation software capable of opening gpx or kml file and route according to this information????
Does SygicMobile(mapmyindia) or MgMaps supports these file format??

Quote:

Originally Posted by anujmishra (Post 2052702)

Most car speedos are known to show higher than true speed. The GPS indicated speed should be much closer to true speed. In many road tests (in some auto magazines, for example), they also give a table of true speed versus speedo numbers and you can see that the speedo numbers are often higher. This is true even with stock tyres.

However, the difference is often about 4-5 kmph and not as high as you have mentioned.

I use MapmyIndia Vx 140, and have compared the speeds shown there against my speedo for long highway drives. In my Palio, surprisingly the speedo is very accurate (less than 1% error)! However, in my SX4, the error is high. SX4 shows a constant error of about 5 kmph (higher speed on speedo than GPS).

When in doubt, I would trust my GPS speed more than the speedo of the SX4. However, if you are using cell phone based GPS, then I am not sure what the accuracy of that is.