the problem there simply is the gps resolution, accuracy and frequency.
if you name a specific device off-the-shelf device that you think should work,
we'd be happy to have a look at it.
in general, you can connect to pretty much anything you want in vizard thu the labjack device/driver (usb device with analog / digital inputs/outputs). a labjack costs some $99.
i always say that if I wanted to control my garage door and coffee machine remotely,
i could quite easily do this with vizard if i want ...
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