In my experience i've been able to find birds a lot more consistently with the gyros than with the radar, although i have never had the chance to fish on a boat with actual commercial-style S-band radar installed. On the boats i've been running for the last few years with 64 mile open array Furuno radars, i have found birds up to 5 miles away, but i've had more success finding action at 6 - 8 miles away with the gyros.
When I'm looking for action at the farthest possible range (6 -8 miles with my eyesight) in the gyros I'm not necessarily looking for individual birds, as they are all but impossible to see at those distances. What i usually look for is a "mirage" on the horizon - a spot that will appear to shimmer in a darker color than the rest of the sky around it. Typically this "mirage" means a substantial flock of birds has gathered and is working a bait ball or school of gamefish, pod of porpoise or dolphin, etc.
It is absolutely IMPERATIVE to scan the horizon SLOWLY. If you move the gyros too quickly you will never pick up on the subtle changes on the horizon and you will skip right over these "mirages" that I'm talking about. It usually takes me a full 5 minutes to do a 180 degree sweep from port to starboard if I'm looking for bird schools at the outer limit of my vision. Everyone's eyesight is different, so your ability to pick up birds at extreme distances is going to be directly related to how well you see with or without binos. If your eyesight is good, you should be able to cover 15 - 20 miles (8 - 10 in each direction from the tower) with one 180 degree sweep of the gyros. You can imagine how much more fish you are going to be able to catch by doing this, particularly when you consider that the naked eye can only pick up bird schools at 1 - 2 miles.
Once you've located that "mirage" take note of the direction with a quick check of the compass and then run or troll towards it until the spot takes shape and you can clearly see the birds. Not all bird schools mean gamefish, but the more birds you spot, and conversely the more you run down, the more fish you are inevitably going to catch.
On a final point, it's important to remember to put the binos down and look around with your naked eyes from time to time too. It's easy to get stuck in the gyros and miss fish that are popping up within easy eyesight of the boat. I'll usually do a 4 - 5 minute sweep with the gyros and then spend 4 - 5 mins scanning the water within normal eyesight range of the tower.
You get into this rhythm, learn to be proficient with a good pair of gyros, and you'll be surprised at how many more fish you catch!
Tracy has a great selection of gryos found here:
http://www.meltontackle.com/categories/binoculars/
I don't see the Nikon's 14 X 40's listed on this particular page, but they are great cost effective gyros as well for around $1,200.


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