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Makojoe the differance between that one and themodel number I gave you is mine has speed and temp while that model only has temp. I checked their website and they have the 525st and it is $116. Other than that they have the same specs.
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Thats ok cause I have the GPS for speed, and I am not all that concerned about speed in the first place.
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big jay The more powerful unit will definately give you a clearer picture, even in shallow water. Sometimes the literature says its better for the deep water, but that's really not the major advantage. With the bigger set, you are better able to distinguish tuna from bluefish, and bass from blues. And you can definately pick up bait better with the bigger machine. Also, if you do any codfishing at all - the bigger machine makes fishing easier.
Sometimes I set our machine on dual display, and its surprising how sometimes I'll pick up bait balls on 53mgz, that barely show on 200 (that said, I most often use the 200).
Here is the best analogy I can think of -- we just replaced our Radar last week and when it came down to antennaes - we chose to upgrade from from the 24 mile to the 48 mile. - I'm never in a million years going to pick up a target at 48 miles (not even 24 for that matter), put the increased power gives a much clearer picture of everything inside the normal range that we monitor - I can now see every single lobster trap, and can get a much better read on the direction other boats are traveling.
Hope that helps a little.
Oh, upgrading the transdoucer can help if you don't want to spend the cake on the bigger unit. We've got the monster Airmar, and its a nice addition.
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Bigjay, Thanks for making my desicion that much harder!
Really all you guys have been a great help!! Thanks alot!!
Well my wallet is telling me what I need to buy so its going to be the 620, I just have to see which transducer I want?
The unit is $677 and the transom ducer is $90 so ltes say $800 I might be able to squeez another $100
But akk the other ducers are thur hull and I am a little scared to drill a hole in my boat?