Ive got a Hummingbird 587 cihd, 5 inch screen, older (prob 3 years) gps/sonor combo...$500 one way or the other.. very happy w it.... comes w basic charts, takes card... gps is nice, yesterday morn was on Seneca Lake NYS, fog so heavy could not see 100 yrd in any direction,, that lake is 30 miles long and 1-2 wide.. I had zero idea on my direction until I popped up the gps, lake image popped up, played arcade game and followed my boat icon,, good to go

that is why gps is a must have.. if you like to fish, some mornings you deal with fog. IMHO you don't need to spend 1K for a good unit