If you are mounting your new plotter on the binnacle guard, be sure to delve into the install instructions about Safe Compass Distance. Many retailers like WM will feign ignorance of important stuff like this.
We were allowed to "check out" several new plotters from our local marine electronics shop and hold them right where they would be installed, a half foot above the steering compass. Most had the powerful permanent MAGNET chip door closure and really moved the dial !
I went with a Lowrance 9" plotter with the friction-catch chip door and no magnetic interference. It gives us HD radar in full screen, split screen, or overlay.
If you go with the HD radar and integrated chart plotter technology from Simrad/Lowance, I believe you will start liking it in a couple of seconds. (!)
I can turn it on in our marina and "see" the rows of boats and distinguish individual boats.
Regards,
Loren