the marker are embedded in the item itself.
in Zoom h5 there are called marks (you can set a f.i. mark when pressing
the record button while recording)
in the Zoom H5 you can scroll through the mark-list
look at page 51 of the H5 manual.
ERR shows one or more skipped samples, maybe the sd-card was too slow..
the wave form should be interpolated from the samples before an after the ERR mark.
found this
http://zoomforum.us/viewtopic.php?t=21767