u mean battery life, how long can your PDA last before need recharging? battery life dunno la, but of course, if u're using BT GPS, battery drain faster than using plain inbuilt GPS

that's what i'm confused about.

according to imperialrealcs at post no. 67 here http://forum.lowyat.net/topic/388760/+60, he said that those with built-in chipsets drain battery much faster because they must power the chipset as well while BT GPS has it's own battery for the chipset.

hmmmm, lets see.

inbuilt GPS: your Pda must power GPS, and the software

BT GPS: pda must power bluetooth, which is not only on, but CONSTANTLY transfering data. Plus the software of course.

I'm not too sure, but my money would be on that constantly transfering data via BT uses a lot of battery

EITHER way u choose, your PDA will not last long, about 3-4 hours if you're lucky

Solution, get a PDA car charger. No worries at all

Thanks for sharing your experience. My car's electrical socket is being used for something else now, you see.

Anyone else have any opinions?

Speaking of BT GPS, how to go about? Of course there is still the need to get the GPS receiver ya?

Sorry guys, a bit on the clueless side here and furthermore, i had problems accessing the 'Net which means i would have missed out on the earlier postings!

Bluetooth GPS is the receiver itself.

Which shop in Klang Valley can we get a bluetooth GPS receiver between RM400 to RM600?

I 've tried asking at a shop at level 3 Lowyat but it cost around RM900.

Is the expensive GPS device better or it just different in brand and manufacturer? Cause the lowest I see at lelang.com was around RM300 and other nearly touch RM1k

you goto bulk there got one rm350 only very cheap i must say

I think got some better accuracy, (chipset) while the more expensive ones can detect more sattelites at a time, though for our use, 8-16 satellites is more than enough. the expensove ones can get 32, but no point wan since u dun need so many

You can order it from

http://www.skybees.com.my/webshaper/store/...roductItem=1414

Bout the accuracy, I would like to rectify my earlier statement bout the accuracy of my GPS unit. The stated accuracy for mine (16CH) is <7m (Non DGPS) and <1m (DGPS)

I attach herewith the tech spec of my product.



This post has been edited by liewss80: Jan 3 2007, 09:39 PM

What is the different between 16 channel and 32 channel? Because I have seen this GPS unit with 32 channel?

Hi ppl,

im a total in GPS n PDA...but after readin the post in this thread...quite filled edi...hehe...so, now for me to get the GPS working...i need to buy the BT GPS receiver...buy the software....install in pda....download the map....and start using rite???....

just one question....this entire gps service is free is it?....coz my gps receiver can just connect to any satellite and use it for free ar???.....

yeah just connect and its free from there on in.

16 channel and 32 channel is believe is the number of sattelites at a time it can detect max. which in my opinion not much diff also. thats cuz u connect also can normally detect 5-8 onli i think. which is more than enuf.

so if can detect so many, but if i am in a building or under ground tunnel , i totally lost the gps signal also rite??

what if got alot of trees?? under it also lost gps signal??

16ch means, it can connect to 16 satellites simultaneously. the more it connect, the better. gps needs at least 3 signals to get coordinate. its math. but normally, my 16 ch not even fully used. maybe not enough satellite up thr. hehe. anyway, i'm very satisfied with de accuracy already.

then in wide open seas or jungle also can get tracking la?"?

as long as can c sky, no prob. if in tunnel, no matter how many channels also no use. cos no signal.

GPS started off with only 24 satellites orbiting the earth (dunno how many now), put up there by the US Army, so at any one time any one location you can get only a number of satellites visible from the location. Accuracy depends on the number of satellites the receiver can detect based on its sensitivity (SIRF III chip at least!) AND the strength of signals it can detect. It'll need at 3 sets of signals with strength of above 50% to triangulate its 3D location (coordinates AND levitation). The stronger the strength of its signals, the higher the accuracy (currently 3 meters radius the best you can get). The more channels it supports means that it can continuously get a lock as it moves.

Between the receiver and the satellites lies many other things, not only tunnels and buildings, sometimes you can be at a open sky location and yet unable to get a lock on your location due to interference, weather conditions, and also if you are constantly moving, you wont be able to lock on your location if you just switched it on (if moving, you'll need to get a lock on location before you move, thats where the importance of "cold start" comes in, or "warm start" if that was the last location on the receiver was before it was switched off the last time).

Kindly asking if there is any GPS user this system for other than road nagivationin the city like off road tracking, sea or land survey. Can tell me more about it. Thanks in advance