[mkgmap-dev] Unknown sea generation option 'floodblocker'

Mon Jan 5 13:55:37 GMT 2015

I am using mkgmap-r3392
In my stylefile there is the following parameter

generate-sea=multipolygon,floodblocker

I am getting the following error

Unknown sea generation option 'floodblocker'
Known sea generation options are:
  multipolygon        use a multipolygon (default)
  polygons | no-mp    use polygons rather than a multipolygon
  no-sea-sectors      disable use of "sea sectors"
  extend-sea-sectors  extend coastline to reach border
  land-tag=TAG=VAL    tag to use for land polygons (default natural=land)
  close-gaps=NUM      close gaps in coastline that are less than this 
distance (metres)
  floodblocker        enable the floodblocker (for multipolgon only)
  fbgap=NUM           points closer to the coastline are ignored for flood 
blocking (default 40)
  fbthres=NUM         min points contained in a polygon to be flood blocked 
(default 20)
  fbratio=NUM         min ratio (points/area size) for flood blocking 
(default 0.5)

I am wondering, why floodblocker is listed as known option but unknown at 
the same time.
What is my error here?