Position Fixing: The Most Important Element of Passage Planning - MySeaTime
Radar fix without “radar required” : r/flying
Remote Sensing | Free Full-Text | A Method of Increasing the Accuracy of Radar Distance Measurement in VTS Systems for Vessels with Very Large Dimensions
Bye, Bye Birdie #1: Raw Radar Navigation - PassageMaker
File:Chart with radar fix.svg - Wikimedia Commons
Position Fixing: The Most Important Element of Passage Planning - MySeaTime