It' a nice unit and the internal antenna will work well if it has a fairly clear view of the sky.
As for radar, I started with a seven inch screen, and very soon went to the 10.4 screen.
For radar the bigger screen the better. The five inch screen for radar for me would just
be to small. Radar is an expensive item. If you add radar think big screen.
Other than that you should be happy with the 527, very good fishfinder.



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