On a clear morning with no to little wind they will start popping in and out around 100 or yards out maybe more. more that enough time to to react. Garmin does have the radar and I am 99.9% positive you can over lay on it also. I have the digital radar on my boat, it is a little more expensive but it comes on right away, you don't have to wait for the tubes to warm up before you can start transmitting with it. With the gains up and sea and rain clutter turned off all as low as possible if it is more that 1-2' out the water I can pick it up from a pretty good ways out. All in all I am glad I put it on my boat.
Mark
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