I have Grand Prix Edition so I don't know if Rookie is a good comparison. I also don't know if my running the app in my home, without it being associated with a track is a valid evaluation.
Classic Timer is all that shows and the hands do not move when I start it, just like what was happening when I ...

I have an iPhone Xr with version 15.6.1. and I'm running your Grand Prix v24.7.
On 11-12-2022 I raced at Thompson Raceway, trackID: 2185. I've successfully used the timer at this track on several occasions. This last time I could only get the Classic Timer to open. The "Timer" would not open. Timer ...

OK, I'll buy that. Thanks.
Looking at the list I am confused about which way to go. Wi-fi solution is $120. GoPoint Technology 9105 BT1 is $100. One is slower, while the other uses more battery. Since I am new to this is there a way to compare or quantify what might be lost by one being slower or ...

I'm new to this. Just purchased Lap Timer Grand Prix which I will use with a GoPro3 Black.
I have a two year old Bluetooth OBDII: Mini ELM327 Bluetooth OBD2 OBD-II CAN-BUS Auto Diagnostic Scanner Tool.
I have not been able to get my iphone to recognize it. My laptop immediately recognized it. On ...