Atomic 4 - Ignition Timing

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[YOUTUBE]2ysFGcm8oNo[/YOUTUBE]

[campbdon]

Adjusting Ignition Timing (with EI)

Hi, that's a wonderful explanation video by DonM on how to adjust the timing. When it comes to refining the timing for cruising speed would the procedure be valid if done while tied up at the slip rather than on open water? The former would be easier for a single-hander.
Thanks
DonC