Calculators

Intensity and Range

Effective Intensity (given range by night) 

Effective Intensity (given range by day)

Range by Night (given effective intensity)

Range by Day (given effective intensity)

VLB-44 

VLB-44 Solar Calculator

VLB-36 

VLB-36 Solar Calculator

VLB-5X - NEW

VLB-5X Solar Calculator

VLB-5

VLB-5 Solar Calculator

VLB-B

VLB-B Solar Calculator

VLB-3

VLB-3 Solar Calculator

VLB-2

VLB-2 Solar Calculator

VLB-1

VLB-1 Solar Calculator

 

Tables & Formulas

Download tables for determining day and night range of signal lights, and formulas for use with rotating and flashing lights.

References

IALA Recommendation E-200 on Marine Signal Lights, Edition 1, December 2008.