Ships staying away from land on map???

Hi, I got a map to come up for a home mod. (At long last). Just wanted to add some islands to a map. The islands came up fine but when i try to get ships close to the island they won't go to the shoreline. I have definately got shallow sea surounding them which i thought would be the prob. Any pontrs out there.

With thanks
Big Bear

Is your map_heights also correct?

Hi got the sucker working so i can go onto the bit of modding i like, units and texturing.

With thanks
Big Bear