Tom Tom idea

[Davey182]

Hello all,

I was looking at my old sony ericsson p800 today and as some of you may know it used symbian software. So like a computer, you could put new programs on it...

And it got me thinking, can you do this for a tom tom?? Surely it'd be pretty simple to design a program that gave you info on your performance, ie 0-60 times etc...

Any ideas??

Links please if there is anything like this out there...

 

[MikeDX]

Tomtom3 (on the pda) supported plugins, I was going to created one that worked out your average mph and gave other road stats, but they changed everything in 4/5. maybe it was 4 actually, not 5.

You could write something easily that would read the raw NMEA sentences from any GPS receiver and dump out some stats.

 

[Nez]

Yeah, It can be done. I had a customer at work who could play movies on his, iirc the OS is windows mobile pocket pc. So basicly an overweight PDA. lol

I've got the TomTom navigator software on my PDA, but looking for some software that records 0-60 1/4 mile times etc..

Theres a guy on here who has the software but it only works on Mobile Phones with S60(i think)

 

[Davey182]

Anyone know of any good websites other than Pocket GPS World??

 

[sn00p]

On any given run your timing error could be up to 2 seconds long, not including the errors in the commercial grade gps unit that you own.

 

[Davey182]

maybe, my tom tom doesn't seem to have any delay though...

 

[MikeDX]

That's because it's always lagging.

If you see the raw data from a GPS device, you'll see the data doesnt actually come through that quickly, then you have a triangulation delay, draw delay.

What most modern GPS systems have is an inbuilt compensator that keeps your current position at best guess based on the last few readings. This keeps it running when you lose the signal momentarily but loses accuracy if the signal is lost for too long.

 

[Davey182]

but even a delay in the 'real' data wouldn't matter if it just took 2 secs to analyse performance. Should I not trust my GPS speedo then???

 

[MikeDX]

The GPS speedo is at best, a "best guess" but likely to be more accurate than the speedo in your car.

 

[Davey182]

the speedo in my car is erm, how can we say, very 'over reading'?! lol

 

[MikeDX]

Most cars are!

My old hyundai was nearly 7mph out (over). my MK3 is about 3mph out which isnt so bad.

 

[sn00p]

but even a delay in the 'real' data wouldn't matter if it just took 2 secs to analyse performance. Should I not trust my GPS speedo then???

Yes it would because on a 0-60 run it could result in an error of 2 seconds.

While pootling along the GPS speedo will be more than accurate because you're looking at a snapshot of time.

If you're talking of a 6 second run, that's a possible maximum 33% error!

All commercial grade GPS units output a fix at a rate of 1Hz so if you catch it wrong on the 0-60 run, just after a fix and then at the end of the run, just before a fix you'll end up with a ~2 second error.

 

[Mark5290]

Tempes GTi will work on a Symbian based phone - http://www.tempes.com/index.html

http://www.tempes.com/index.html

 

[M1TCH]

you could buy the tomtom creator program if your a wizz on that sort of thing I'm sure you could do anything with it.

cant remember what its called, surely its out there for download

 

[sn00p]

The TomTom SDK is crap & pointless.

If you want to implement this, use use the NMEA stream coming from the GPS unit, if you know how to program it shouldn't take you more than a couple of hours to knock something up that "works".