i fish off the south west victorian coast , from apollo bay to port mac. upwards of 40km. i use a garmin 7408xsv with a gt51 600w-m chirp transom transducer. . i used to run a simrad nss7evo2 with a p66 600w 50/200 airmar. which was fine and nice. but i like being able to distinguish larger fish among st school fish in the top 150m. i also find it stupidly easy to use.