Distance to Horn, more-or-less following the channel, is 11nm

Distance around Deer is more like 17nm

These as the crow flies.

Courtesy of, and all this is free...

www.maptech.com (Chart Navigator, free download)
and
http://chartmaker.ncd.noaa.gov/mcd/Raster/download.htm

FREE, >>UPDATED<<, chart downloads. In fact, you can get the software at Maptech via the NOAA page.

Chart of interest here is 11373_1, Mississippi Sound and Approaches, Dauphin to Cat Island

Weather? See here... (paste in as one line)
http://weather.noaa.gov/cgi-bin/fmtbltn.pl?file=forecasts/marine/coastal/gm/gmz555.txt