Has anyone used lakemaster chips for truman lake? buying a new humminbird 597ci di hd and need to know if there is a chip that will work for that unit from Lakemaster or Navionics for truman lake. I have a fishing hotspots (fhsp-s southern usa- 286 premier lakes) put out buy LEI. seriel # 051-2924-00. Wondering if this chip will work in the humminbird or is ther a better chip for truman lake out there that will work for that unit. I preordered the humminbird from the factory outlet store. They will not be available till mid feb so cannot put my old chip in to try it. any help appreciated.