I built a FS18 and am weighing my options for a sonar GPS combo. I fish lakes and rivers in the Midwest and want something with side imaging capabilities. Based on what I have heard so far I would say Garmin is out because their maps suck and there’s no way to add better charts. I’m looking for solid unbiased advice from people who can site their sources and provide rationale. Please no “Ford vs Chevy” type bullshit.