Originally Posted by
Sallom89
Hello everyone, Yesterday and the day before I was hitting unusual speed for a beginner like me. My max speed was 45.5 kph on flat usually with out help of winds ( I think so, because it happened on many occasions). The speed I reached was once 50 and the other was 52 kph respectively on my latest attempts, on both occasions when I go to gramin training center graph it doesn't show that speed on top of the speed graph yet it only shows this speed in "max speed" section.
Can I tust garmin for this max speed ? is it correct?
GPS can be very unreliable depending on many factors. You have satellite availability, reception, WAAS reception, sample rate, firmware bugs, hardware glitches, etc.
In short, NO you cannot trust your Garmin for much more than an overview. If you see outlying data, you have to disregard it. Newer firmware may improve the accuracy of your unit by automatically rejecting outlying data or by increasing the window that it uses to calculate velocity. With the 305, you can also increase speed data accuracy by using the wheel sensor, which can measure actual moving speed instead of calculating speed based on position.