Usually those 'maps' are Java applets if I am not wrong.
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Use a provider like goldstargps or ituranusa or even datatrackfms there are a lot out there any way they will send you a device to install on all trucks or what ever you want to install it on then a login to a sure most these providers also have customs API codes you can use to have a different login system on your custom site which is what you want.