The Web App is FREE. You see that on the Navionics web site.
It is not interactive-- just a map viewer.
Edited by Wayne P. (05/29/15 11:10 AM)
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1