I have a gen1 helix that the plugs in the back went out...I bought a new boat that has all gen 3 units...my question is is the mapping any better on gen3 vs gen1 units? I'm thinking about fixing it(250.00$ is what it will cost to send back to humminbird) and stacking in the front to have one dedicated to mapping but didnt know if the mapping software has changed...thanks guys