People are trying to better trackers by taking the simple way they work and adding lots of complicated ways of getting the information.
You only need two things. A simple GPS tracker and external antennas.
Whatever you have it needs to be well hidden in a place no one can look.
Thats it. You can add as much crap as you like and pay a web site as much as you like but it wont help in a blind spot and it wont help if a burglear finds it and pulls the plug. The only other thing that may help is a dedicated battery that again is hidden and un disconectable.
Take the usual inexpensive unit available from tinterweb.
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Throw a pay as you go sim card in it (one with decent coverage in your area). Stuff the per minute text per pound bull crap you wont use all that.
If the unit comes with a remote control. Bin it.
If the unit comes with a wiring loom that could run a space rocket, cut every wire out of it except the live and neutral.
If the unit comes with a relay, bin it.
If it comes with a microphone, bin it.
Right, you now have a basic dial up to locate unit.
I personally dont like running such things on raw vehicle voltage. Its a bit up and down and can cause problems. I therefore run them through a 12v regulator. They are only cheap and you can get them with a built in fuse. The unit probably has one built in but I like to make sure.
Mount the unit in an undiscoverable place along with your regulator. Mr thief will look in the obvious places so be a little creative.
Now the hard bit.
You have two antennas. One for normal mobi things and one for Gee Pee essy things. Both need to be mounted as high as possible and as open as possible. Open that is to the sky.
Euro boxes such as frords and dihatsuns have nice deep dash boards and parcel shelves with only glass over them. This is where mr thief is going to poke his wire cutters first. Again you need to be as subversive as them and think out the box. The tin box that is. The cables to these are also instantly recognisable so they must be hidden or disguised.
Switch it on.
Send it the code for your mobile so it sends you its location and a security code..
Several other mobile numbers can be used as well. (see chinglish instructions kind purchaser.)
Text it; 'disarm+code'
It now switches itself into sleep mode. It wont use air time and it shouldnt send you any texts telling you next door but one has left the gas on.
I say shouldnt but the one I have sometimes gets a little lonely and lets me know I have run out of diesel even though that bit isnt wired up and I have three quarters of a tank?
I just send it the disarm command again and it keeps quite for a few more weeks.
If you need to know its location at any time you simply phone it up. It sends you a text with a link and when you press the link, up pops google maps with a pin.
For the grand sum of one text message.
Dont worry about sims turning themselves off if you dont use them. They will last a year before this happens if at all and I'm sure you will use it more than once a year to re start the countdown.