I've looked into it for a number of small clubs here, scared away by the AMB pricetag - the alternatives are all infrared based and thus require line-of-sight. AMD / MyLaps is of course radio-based, so no LoS required.
IR systems work fine, but you have to set up the arch or spotter (there's one from Sweden, DirtChamp, with Bluetooth wireless connection to the computer) somewhere the cars are likely not to crash, as an upside-down car sliding across the line will not get counted.
I'd be keen to know of any other radio-based systems.
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