Lowrance Finder Help

[Joker619]

Does anyone use the Lowrance Mark 5x pro or Mark 4 fishfinders on their yaks. If so, can I get some feedback on how you like them and what you may not like. I've narrowed it down to these two and not sure which one to get. I like the nice bigger screen on the 5x but the gps function on the 4 doesnt sound bad either. I'm gonna be doing probably 50/50 bass fishing in the sd bays and then all types up in La Jolla. Is the gps necessary and a big help? Both are in my budget for around $200 if you're wondering why not the elites or something more expensive. Gonna be mounted on a trident 13 in the little fishfinder compartment. Any help or guidance is appreciated!