[ReelMagic]

As the majority of radar antenna's have an approx 25 degree vertical beam width I don't think there will be a significant impact to performance between 4 degrees and 5 degrees. The only impact is range accuracy and I don't believe that will be significant either.... So a target at 1/4 mile will appear slightly further away or closer, based on the angle, the target will appear on your display and will require vigilance by the boat operator.... At longer ranges the error increases somewhat but again, based on distance, should not be critical and will be detected by the radar. Again vigilance by the boat operator is required........ M2C