I am looking to buy a GPS unit for a boat i am purchasing. The problem is that i am in college and trying to scrounge enough money to fish tournaments. So i have no cash to spare. I want the best GPS for the money. I am looking at it as a carrer investment, LOL. I do want color. Other than that the board is open and i have never owned GPS before so i don't know where to begin. But i do want the most detail i can get, also i mainly fish Central and Southern Kentucky Lakes, but i do occasionaly travel on tournaments to areas such as Pine Bluff, AK, or Lewisville, TX. And i want a GPS unit where i can add those random lakes as i need them even though i will probably never be there again. So i don't wanna have to buy a card for each one of those areas every time i wanna go to a new lake. The boat is Equiped with Lowrance X-15 and LMS-160 and X-65. But I will probably sell those to upgrade. I don't care about color on the sonar but i want it for the GPS.