Hummingbird 595c. Will it accept a navionics card?

says so on the humminbird website

http://store.humminbird.com/humminbird-products/sonar-gps-combos/500-series/595c-combo/prod406320-1.html

Well they are on sale for 399 through cabelas, and an additional 50 dollar rebate, I had to buy one.