Sonar.
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Member BS Pro-Staff and Billbob Pro-Staff
Proud Member of Team Geezer... authorized by: billbob and "G"
i just bought the helix5 SI/DI GPS- never had DI or SI so we'll see what happens- also has switchfire sonar- just picked it up yesterday - ill let ya know how it goes- $500 - a lil more than what you said but does everything supposedly! (didn't need that shotgun anyway.....got several more) gota warm up before i can get it on the boat tho !
My wife swears I only do enough surveying to support my hunting & fishing because I'm too busy hunting & fishing !