Author Topic: 598ci HD SI vs 688ci HD DI  (Read 2669 times)

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Offline PDX Tightlines

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598ci HD SI vs 688ci HD DI
« on: January 04, 2014, 03:47:35 PM »
Just got the 688 for Christmas, still new in unopened box. There are still 598ci HD SI's available online & I'm thinking about returning the 688 & buying a 598. The 598 has better resolution 640 x 640 vs 480 x 640 for the 688, but my concern about the 598 is around the Sonar Frequency The 2D is 83/200 kHz, while on the 688 it's 200/455 kHz 2D. I know the Side Imaging is a great added feature on the 598, but I'd probably run the unit in 2D as much as DI and or SI. I'd also consider the 698ci HD SI, but it's more than I'd like to spend & the resolution is the same as the 688.

I'd appreciate your thoughts and input.


Offline Humminbird_Greg

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Re: 598ci HD SI vs 688ci HD DI
« Reply #1 on: January 07, 2014, 09:40:23 AM »
Welcome to the Humminbird Side Imaging Forums PDX Tightlines.

My thoughts: it all depends on how you are going to use your sonar.  If you know the locations of the structures you will be fishing and want a more detailed view of those structures, then the 688ci HD DI unit is a good option.  However, if you are going to use your sonar unit to look for structure to fish, then you can’t beat an Si model unit and you should go with the 598ci HD Si unit.  The DI sonar on the Si units is less detailed but the ability of being able to spot structure and fish far out to each side of the boat outweigh this in my opinion.

Greg Walters at Humminbird
gwalters@johnsonoutdoors.com


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