Samsung S23 vs cheap external receiver

Hi all,

I've been using RC on my phone without any external receiver for quite sometime now and with good accuracy in terms of lap timing. This was in car racing, this year I'm racing karts and many people are telling me that an external receiver is needed because of the small distance between straights. I did not try yet but do you think this is true? And would a cheap external receiver give better results than my S23? I am only interested in lap timing and sectors, no other data.

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