Posts: 1663
Location: Kodiak, AK | There's a lot that goes into that. If you're fishing small water that you know like the back of your hand, you may not need GPS. But GPS is good for marking fish you've contacted so you can go back and hit them. You can also make your own chart of the bottom by laying icons on weeds, rocks, countours, etc that the stock chart may not show; or like weeds, can move from season to season.
Sonar of course, and temperature is good too. Learn to read your sonar properly and you can see everything you need to know. Color screens are nice to have, but greyscale screens work fine too.
SI/DI is nice, and can really show you things you wouldn't normally see or be able to make out. But remember it's not a replacement for conventional sonar. It's awesome, but far from a requirement.
Don't be afraid of too many features on the unit because if you can't figure out how to use them, or just choose not to, they're not going to hinder you by them not being used. So it really comes down to what you want to spend. You don't need to spend $3,000 on electronics, but I'd advise getting the best you can afford.
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