Which marine electronics should you buy? Complete guide for boat owners

The most important systems for safe and efficient navigation – VHF radio, GPS, MFD, and sonar.

The question "what should I buy?" is common in the marine Industry Terms. As more people buy boats and do their own installations, the topic has become broader than ever.

Why there is no universal answer

There is no simple answer. Different boats have different needs depending on size and area of use. A small RIB does not require the same equipment as a 50-foot yacht or a passenger ferry.

Basic equipment for all boats

Regardless of vessel type, there is certain electronics that should always be on board:

VHF radio – Your lifeline at sea

• Fixed VHF: Powered from the boat's electrical system.
• Handheld VHF: Battery-powered and portable. Crucial in an emergency to send a mayday to the coast guard.

Digital Selective Calling (DSC)

Fixed VHF radios offer DSC, which sends a distress call with your GPS position to emergency services.

GPS – More than just navigation

• Internal GPS: Built into the display.
• External GPS: Uses an antenna for a stronger signal.

GPS improves navigation, increases safety, and efficiency.

MFD – Multi-Function Display

An MFD integrates GPS, sonar, and other systems. You can plot waypoints, follow routes, and get an overview of the area – even in bad weather.

Sonar – Avoid grounding

Sonar shows the depth below the boat and can be connected to the MFD for shallow water warnings.

• Smaller boats: Usually one sonar.
• Larger vessels: Often several sonars (2–4) for port, starboard, bow, and stern.

Other useful systems (optional)

• Weather data: For wind and weather monitoring.
• Autopilot: Maintains course and follows routes.
• Radar: Detects vessels and obstacles in poor visibility.

Summary – Essential electronics

The four basic systems for all boats:

• VHF radio
• GPS
• Sonar
• MFD

Other systems can improve safety and comfort, but these are a must for safe and efficient navigation.