Honestly, I'm rigging a new boat to start guiding and haven't ran either unit many hours. I'm not as big a user of SI as many here and the DI on the 1199 is computer generated. I have been amazed at the detail shown on the Helix 10 DI/GPS. I've ran 788, 898,998s and now the 1199. I knew what the unit was capable of and what it was not. I just wanted the largest screen I could afford on both units. I will say the Helix 10 is SO MUCH brighter and clearer in my mind.I don't want a SI unit on the bow.
Here are more and some clearer pics from a thread I started; I'm using a LakeMaster v3 card and the green area next to the boat icon is a flat that had 6 or so feet of water on top at winter pool.
http://www.crappie.com/crappie/fishi...elix10-di-gps/