A few questions to those who may know regarding this unit. It came with one of my project boats and appears to be in good working condition. Is this an out of date fish finder or is it a higher quality CRT unit still worth installing. My current fish finder is about 20 years old and was curious if this old unit is comparable to newer ones made today. The size is an issue but I can accomadate it if I know it is worth installing. Can not afford a new state of the art unit.