Here's the RBN? definition of the difference between SKIMVALID and NOT SKIMBUSTED:
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"Skimvalid looks back to see if there are two or more spots of the same call, on the same frequency (+/- 0.2 KHz) before marking the spot as "Valid". Obviously, that will help with single busts. Skimbusted works by looking back to see if there is a similar but different spot, already determined to be Valid and posted on the same frequency (+/- 0.1 KHz). A similar call is one that can be transformed into the new call by character insertion, deletion, or substitution."
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In practice, I use NOT SKIMBUSTED because it is is faster - often I get to the spot before the station has even finished CQing. In the long run, I spend less wasted time in established pileups and the occasional busted call is just one wasted click.
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73 John K3TN