My question is, is it safe to keep my bass tracker proteam 175 TX charging system plugged in all year round, I've heard you can boil the batteries and all kinds of other crazy things like burning your boat down, I was just wondering if my charging system is okay to leave it plugged in and charging when I'm not using it ?

It may depend on the model of your charger. My Lowe dealer advised me that I could keep the onboard charger plugged in at all times and that it will trickle charge to maintain the batteries. 

it depends on what Kind of charger you have.

Some, like my Minn Kota, shutoff when the battery is charged and does not come back on until it drops below a certain voltage.

personally I don't leave the charger on for long periods of time. I had one malfunction and boiled 2 of my batteries dry.