Originally Posted by
gauvins
(F5 + 2nd gen speed/cadence)
My experience is that the watch will display speed based on sensor data, whenever available. Noticeable at traffic lights - w/o sensor, you'll see speed going down while you're stopped, and pick up slowly when you resume riding. With a sensor, readings are properly (instantly) updating.
I've never noticed my watch using GPS data to calculate speed if my sensor is linked.
My garmin 1030 + with wheel sensor is not instant :/
I bought the speed sensor thinking it was going to be night and day different. At least for me it was not. I am sure it's more accurate and probably reacts faster but I come to full stop before my 1030+ ever says zero.
I know it's reading the sensor because I can lift on the front wheel and spin it the gps shows I am moving.