My brother has a 17.5' center console boat he takes out fishing on lake Erie, weather permitting. We are wanting to buy him a new fish finder as a gift. He currently has a 20 year old Lowrance, which works very well, however (2) issues with this fish finder are: 1) It is difficult to see screen on bright days, and 2) there is no GPS capability. Any suggestions would be appreciated. Thanks in advance.