I don't think the HB698ci hd si have ethernet capabilities or it was not on this list here. But someone on here may know another way.

http://www.humminbird.com/Category/S.../FAQ/Ethernet/

Humminbird has several models which are currently Ethernet capable.
ION SERIES - ALL MODELS ONIX SERIES - ALL MODELS 1100 SERIES - ALL MODELS
900 SERIES 800 SERIES - ALL MODELS 700 SERIES
999ci HD SI 798ci HD SI
998c HD SI 788ci HD
998c SI 788ci HD DI
959ci HD XD 788ci HD XD
959ci HD DI 778c HD
959ci HD
958c HD XD
958c HD DI
958c DI
958c HD
958c
HELIX 9 SERIES - ALL MODELS HELIX 10 SERIES - ALL MODELS HELIX 12 SERIES - ALL MODELS