Super refraction causes an increase in maximum detection range. This is caused due to meteorological factors like temperature inversion.
According to IMO performance standards the error in the range of an object should not be more than 1.5% of the maximum range scale in use or 70 mts whichever is the greater.
According to the IMO performance standards the object should be measured with ( PLUS & MINUS) +-1 degree of accuracy.
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