I guess it all depends on your fishing method.
I for example do a crap ton of vertical fishing. Whether its jigging brush on JPP or jigging the river for saugers , walleyes, cats, bass, ect. So for me, i keep my bow unit on DI 99% of the time. I dont want to see a big blob on the screen, i want to see individual limbs and if there is fish hiding amongst them. When in the river, i need to see my jig 30-40 even 50ft down to make sure im putting it in the right spots, avoiding snags and sometimes even watching fish hit my jig.
My new Garmin unit has DI and SI....the SI is used when im looking for new brush piles or bottom content changes in new sections of river. At the time i purchased my garmin, 7" was the biggest they made in my model...now you can get the 9" for just a little bit more.
Mapping would be nice sometime, but not required for me. I can still set waypoints, i can make routes/tracks.....so thats all i need personally.
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