Thread: Aftermarket HUD
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      03-23-2024, 11:55 AM   #2
Wilt
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Drives: 2011 328i
Join Date: Mar 2015
Location: SF Bay area

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The HUD shows an indicated speed which is 1mph slower than the digital dash display, and both are optimistic numbers in conformance with German regulatory requirements. For example, digital dash = 70mph, HUD add-on = 69mph, real speed over the ground (Garmin GPS) = 66mph.
The optimism is not so great at street speeds, so the offset is a percentage rather than a fixed margin.
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