If you are looking to upgrade your navigation system, why not bundle a multifunction display with radar.
The Raymarine Axiom line of touchscreen multifunction navigation displays offers built-in RealVision 3D sonar and the LightHouse 3 operating system, which means super-fast quad-core performance for all your navigation needs. Axiom is expandable, so its capabilities can grow, while the Wi-Fi and Bluetooth connectivity allow you to connect to the latest Raymarine apps for tablets and smartphones. Combine it with the Raymarine Quantum 2 Chirp pulse compression radar by FLIR. The Quantum 2 provides superior target awareness with collision avoidance technology at both long and extremely short ranges. Using advanced Doppler processing, the system instantly highlights moving radar contacts and colour codes them to indicate whether they are inbound or outbound. The unit weighs less than half of traditional magnetron radars and has very low power consumption.