Here are the numbers from the Humminbird web site.
898c SI Combo
Display
7.0″ diagonal
480V x 800H
Color TFT
Memory
Waypoints: 3,000
Routes: 50
Tracks: 50 w/ 20,000 points each
Sonar
DualBeam PLUS
200 kHz / 20° @ -10db
83 kHz / 60° @ -10db
Depth: 1500 ft.
Side Imaging & Down Imaging
455 kHz / (2) 86° @ -10db
800 kHz / (2) 55° @ -10db
Depth: 150 ft.
180° total coverage Power Output
1,000 Watts (RMS)
8,000 Watts (Peak-to-Peak)
GPS Features
50 Channel GPS
Trackplotting
Chartplotting
GPS Speed
Humminbird Contour XD™
Navionics Compatability
LakeMaster Comptability
Network Modules
WeatherSense (optional)
Wireless Sonar Link (optional)
CannonLink (optional)
InterLink (optional)
Warranty
One Year
998c SI Combo
Display
8.0″ diagonal
480V x 800H
16:9 Color TFT
Cartography
Navionics Compatible
LakeMaster Compatible
Memory
Waypoints: 3,000
Routes: 50
Tracks: 50 w/20,000 points each
Sonar
DualBeam PLUS
200 kHz / 20° @ -10db
83 kHz / 60° @ -10db
Depth: 1500 ft.
(3000 ft with optional 200/50 kHz transducer for deepwater use)
HD Side Imaging & Down Imaging
455 kHz / (2) 86° @ -10db
800 kHz / (2) 55° @ -10db
Depth: 150 ft.
180° total coverage Power Output
1000 Watts (RMS)
8000 Watts (Peak-to-Peak)
GPS Features
50 Channel GPS
Trackplotting
Chartplotting
GPS Speed
Humminbird ContourXD
Navionics Platinum (optional)
LakeMaster (optional)
Network Modules
WeatherSense (optional)
CannonLink (optional)
InterLink (optional)
XMWeather (optional)
Warranty
One Year