FIY @slurms, you can change the update rate of Dual XGPS150A to 5 Hz using the Dual's "XGPS status tool" app in iOS.
There's slight incompatibility in current RaceChrono for iOS version 5.1.1, so the 1 Hz mode is actually 0.3 Hz. The 5 Hz mode runs just fine. This will be fixed in 5.1.2.
Dual XGPS150A and RaceChrono for Android version 5.1.1 runs fine in 1 Hz mode, but there seems to be no way to change it to 5 Hz mode.
for whatever it's worth, I did not have good luck with the 150 even on 5hz mode (really it was 4hz). Location accuracy was just not that great. Garmin GLO is significantly better for me
Track lines for the xgps 150a were not great for me. Some laps seemed to be off track un a couple of corners. It may be the acuracy of the device. GPS FW and app updated until last Nov 2020. Definitively best to try better options.
Comments
There's slight incompatibility in current RaceChrono for iOS version 5.1.1, so the 1 Hz mode is actually 0.3 Hz. The 5 Hz mode runs just fine. This will be fixed in 5.1.2.
Dual XGPS150A and RaceChrono for Android version 5.1.1 runs fine in 1 Hz mode, but there seems to be no way to change it to 5 Hz mode.