Stealth is correct. They are sounding readings. On NOAA charts those numbers represent fathoms(1st number) and feet (2nd lower case number). You may be able to check your depth finder manual or Navionics to see if you can change the depth readings to feet. You can download "U.S. Chart No.1" from NOAA to see all of the legend information for almost every nautical charts.
On that map they are depth readings. 2 with small 9 = 2.9feet, 0 with small 5 = .5 feet or 6"
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