Posts: 304
Location: Lino Lakes, MN | 999 has the faster processor and an Internal GPS antenna- I believe that the GPS position is also updated 10 times per second vs 4 for the 998 with the external antenna.
I bought the 998 C HD SI last spring and love the detail. It was very easy to get started with. Now I want a second Humminbird.
Both units have the larger High Definition Transducer- If you mount it according to directions you would probably want a High Speed transducer and the Y cable to hook both of them up to the unit. This allows you to get great readings while running across the lakes- lots of people ask why they get lousy views at high speed - thus the second transducer.
I found lots of great information on setup and use of my locator at the Bass Boat Central websight. Great forums on both Lawrance and Humminbird.
Good Luck
Steve
Edited by Sorgy 2/25/2015 9:19 AM
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