Normally CN's & CNU's are released 4 times a year eg: 2012.10; 2012.20; 2012.30 & 2012.40. If Garmin find a problem with a map not long after it has been released and it is a serious one or there are multiple problems, they may feel obliged to issue an 'interim' updated release to fix things rather than wait to address things when the next scheduled release is due. In other words, 20xx.x1 type releases are 'bug-fix' releases and are in addition to the normal 'Garmin calendar' releases. 2013.30 should be the next at about it's expected time (unless they find problems with 2013.21, in which case we might see 2013.21A or 2013.22 or ....).
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