Validation and correction of auto-logged position measurements

Accurate position measurements are extremely valuable in the shipping industry for various reasons such as safety (collision avoidance), security (situational awareness), fuel-saving (weather identification), punctuality (route prediction), etc. Although GNSS (Global Navigation Satellite System) receivers installed on-board ships proven to be highly accurate, data logging process may occasionally problematic, mainly due complexity of and decimal precision that is required. Data were collected from 3 years operations 228 Maersk Line container vessels an analysis reveals there a substantial amount (?20%) historical sent shore does not reflect reality. In study, sources faulty logged categorized interpolation methodology proposed validate correct them by using AIS (Automatic Identification data.