This app simply calculates your bollard pull need to pull a ship or barge under specified circumstances. Program is easy to use and simple to understand. Major Classification Societies' Rules and Regulations (Members of IACS) applied for this calculation which is be quite accurate. Both Metric and imperial units are available in app. App is updated regularly and added new features. *** New Feature ADDED *** Save & Load Function Added. If you desire any other calculation to be in this app, please do not hesitate to contact us