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Does anybody know the difference between the 997 and the 998?
The 998 has a faster processor in it. Which is an advantage when running the newer lakemaster chips as they are packed with tons of info. The 997 will load slow and you will over drive the refreshing capabilities( be looking at a grid) unless you are zoomed out quite a bit while navigation at full speed. Thats just the GPS aspect.
As far as SI and such the 998 will come with an HD transducer for a better side image reading and picture. I think the 998 has a little better screen pixel resolution than the 997 as well but not 100% certian. The series ending in eights can easily be linked via a simple ethernet cable also. The older series have to be hooked through a link module to share waypoints, trails, etc and can be a PIA. If the budget allows go with the 998, you will be much happier. And as Bob mentioned it can be linked with I-pilot and 360.