The new software version 4.0 for the GP1871F and GP1971F combo chartplotter sonar units introduces numerous features and improvements in mapping, charting, sonar, and display. This free new version brings numerous features that can be used with Navionics maps, such as satellite photography overlay, detailed depth contouring and relief shading, bathymetric layers, improved viewing angles, as well as 3D and Panoramic modes.
Recommended retail price: GP1871F: €1,099, GP1971F: €1,499.