What are errors of ECDIS?

Errors Of Interpretation

  • Ignoring over scale of display
  • Uncritical acceptance of own ship position
  • Ignoring difference between True  & Gyro North

Confusion Between Different Type Of

  • Vectors
  • Display mode
  • Reference system

Errors In Displayed Data

  • Source Error :  An electronic chart can be as good as the original data it was derived from.
  • Object Size Error :  The items on the chart are not drawn to scale
  • Position shift :  There will be position shift shown between GPS and actual position on the chart if the GPS and the chart are using different datum’s.
  • Reference Shift or Mismatch :  A difference in the matching during superimposing of the two displays .