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• http//oceansrace.51.net/index.htm
• http//e-service.cwb.gov.tw/docs/V3.0/astronomy/da
  tabase/2003/twilight/civil.htm
• http//www.safetysea.org/training/1st-3officer.htm
  
• http//140.111.1.22/clc/jdict/main/cover/main.htm
• http//content.edu.tw/senior/earth/tp_ml/tidal/tid
  index.htm
• http//163.25.132.133/httm/ame3.htm