WANTED!!! rodboxes

i have a 350 watt do you think i could use that??
but i think i have preety good gps already it is a garmen 182C but i guess i dont no how to use it. but what i really need a spot light for is making sure i sont run in to any body while out and docking they have no dock lights what so ever, it is pick black. let me know.
Fishbonejr.