23/07/2026
EBL & VRM (Electronic Bearing Line and Variable Range Marker)
Electronic Bearing Line (EBL) and Variable Range Marker (VRM) are essential radar navigation tools used to determine the bearing and distance of targets. They help navigators monitor nearby vessels, fixed objects, and navigational hazards, improving situational awareness and collision avoidance.
Electronic Bearing Line (EBL)
The EBL is a movable line extending from the center of the radar (your own ship) to a selected target. It is used to measure the bearing (direction) of a target relative to your vessel.
Main Uses:
โข Determines the bearing of another vessel or object.
โข Assists in plotting and tracking targets.
โข Helps assess collision risk by monitoring changes in bearing.
โข Supports safe navigation and watchkeeping.
Variable Range Marker (VRM)
The VRM is an adjustable circle centered on your vessel. It is used to measure the distance (range) from your ship to a target displayed on the radar.
Main Uses:
โข Measures the range to vessels, buoys, or land.
โข Assists in estimating CPA (Closest Point of Approach) and TCPA (Time to Closest Point of Approach).
โข Helps establish radar safety zones and navigation limits.
โข Improves position monitoring during coastal navigation.
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Key Difference
โข EBL measures bearing (direction) to a target.
โข VRM measures range (distance) to a target.
EBL and VRM are most effective when used together. The EBL tells you where a target is located (direction), while the VRM tells you how far away it is (distance). Together, they provide accurate target information, enhancing radar plotting, collision avoidance, and overall navigational safety.
