Table 9,,
Length of Service,,
,Unlimited License      Mariners,Unlicensed Mariners
Length of tour,,
2 months or less,16%,18%
3-4 months,38%,26%
5-6 months,16%,19%
>6 months,30%,37%
Length of break between tours,,
2 months or less,53%,71%
3-4 months,39%,19%
5-6 months,5%,6%
>6 months,3%,4%
Optimal number of tours,,
1,6%,7%
2,27%,21%
3,18%,16%,
4 or more,49%,56%,
"SOURCE:  U.S. Department of Transportation, Bureau of Transportation Statistics and Maritime Administration, 2002 Mariner Survey, Principal Findings, Washington, DC.",,,