I have a couple of Garmin’s that have configurable speed alarms. By configurable I mean there is a menu option to enable/disable this feature. Both these units would be at least five years old. No idea of the model numbers.
Also a friend dropped by during the week with a 4WD Mitsubishi Canter with large off road tyres and he uses a newer Garmin as his speedometer rather than recalibrate the factory unit to allow for the larger diameter wheels.
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