How do you want to use the sonar of your bow unit?
If you are wanting to search an area for structure, then look at an Si unit up front.
If all you want to do is locate the bow over structure you found with the console mounted Si unit, then look at a DI or a straight 2D sonar unit and save some money.
Some of this will depend too on whether you want to share sonar between your console Si unit and your bow unit. If you go with an Si unit at the bow you would be able to share all sonar between the units.


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