Marine Electronics Cost Guide

This page deliberately avoids quoting prices. Recreational marine electronics pricing moves with model cycles, exchange rates and dealer packaging, and any figure printed here would be wrong within a year — and wrong in a way that misleads rather than merely dates.

What does not change is the allocation problem: given a finite budget, what should it be spent on, and in what order?

That is where most owners lose money, and it is answerable.

#The costs that never appear on the hardware quote

A quote listing a display, a radar and an AIS looks complete. It is typically 50 to 70 percent of the real project.

The last two are the ones cut when a project runs over, and they are the ones that determine whether the system tells the truth. A correctly wired, uncommissioned system is a set of boxes with plausible numbers on them — see commissioning and sea trials.

When comparing quotes, ask explicitly: what commissioning is included, and what documentation will be left aboard?

#The spending order that actually works

1. DC power integrity. Voltage drop, protection, connections, spare capacity. New electronics on poor wiring are still unreliable electronics — see marine DC power.
2. Safety communications. DSC VHF with correct MMSI, a registered beacon, a charged handheld. The cheapest meaningful safety spend available.
3. Sensors. Transducer, heading, GNSS antenna, wind. These set the ceiling on everything downstream
4. Network. Backbone designed once, with spare capacity — see marine networks
5. Autopilot drive. Sized from displacement, rudder and steering load, not length. A premium computer on an undersized drive is wasted money — see autopilots.
6. Radar and sonar for the actual mission. Not for the mission you imagine
7. Display. Last

This is close to the reverse of how most people shop, and it is the same order the refit guide recommends.

#Tiered system examples

The tiers below describe capability levels, not price points. Use them to sanity-check what you are being quoted against what you actually need.

#Cruising sailing yacht, 35 to 45 ft

Essential tier

• 9 to 12-inch multifunction display
• reliable depth with correct offset
• wind, speed
• modern heading sensor
• Class B AIS
• DSC VHF with position input
• charged handheld VHF
• properly sized autopilot
• tablet with offline charts
• registered EPIRB

Offshore tier — adds

• 20 to 24-inch solid-state Doppler radome
• SOTDMA Class B AIS
• dedicated instrument display
• autopilot drive margin, and a backup steering strategy
• satellite messenger
• documented network

Premium tier — adds

• second installed display
• GNSS compass where the magnetic environment justifies it
• satellite broadband
• forward-looking sonar if remote shallow-water cruising justifies it
• cameras

See sailing yacht navigation.

#Offshore fishing boat, 8 to 10 m

Essential tier

• 9 to 12-inch chartplotter-sounder
• quality CHIRP transducer matched to target depth
• DSC VHF, handheld backup
• registered EPIRB
• engine data over NMEA 2000

Serious tier — adds

• 16-inch or dual 12-inch displays
• 1 kW class CHIRP through-hull where depth justifies it
• side imaging
• Doppler radar
• Class B AIS
• hydraulic autopilot

Premium tier — adds

• live sonar, if the fishing technique genuinely uses it
• open-array radar
• satellite communications
• second display for redundancy

See offshore fishing electronics.

#Trailer boat, 5 to 7 m

Essential tier

• 7 to 9-inch chartplotter-sounder
• transom CHIRP transducer, patiently sited
• handheld DSC VHF
• PLB or EPIRB, required safety equipment
• phone with offline charts

Better tier — adds

• 9 to 12-inch display with side imaging
• fixed DSC VHF with position input
• dedicated fused electronics feed, second battery

See trailer boat electronics.

#Motor yacht

Essential tier

• large multifunction display
• Doppler radome
• Class B AIS
• autopilot matched to the hydraulic system
• DSC VHF
• engine integration

Premium tier — adds

• dual large or ultrawide displays
• Doppler open-array radar
• GNSS compass
• thermal camera
• engine-room and docking cameras
• satellite broadband

See motor yacht navigation.

#Staging an upgrade over several seasons

A staged approach spreads cost and lets the boat teach you what it needs. The total is usually slightly higher; the risk of buying the wrong thing is much lower.

Stage 1 — power rectification, new NMEA 2000 backbone designed with spare capacity, primary display, retain usable sensors.

Stage 2 — AIS, radar, heading upgrade.

Stage 3 — autopilot computer or drive as required.

Stage 4 — instruments, cameras, advanced sonar.

The critical discipline: design the backbone and Ethernet plan once, properly, at stage 1. Staged refits become fragmented systems when each stage adds network improvised around the last.

#Value decisions worth making

Keep, do not replace:

• a quality through-hull transducer in a good fairing block
• a sound autopilot drive with a serviceable ram, quadrant and mounts
• a recent AIS transceiver
• compatible NMEA 2000 sensors
• a good VHF antenna and sound coax

Replace equipment because it fails the mission or the compatibility plan, not because it is old.

Spend, do not economise:

• the transducer
• the heading sensor and its location
• cable gauge and circuit protection
• the autopilot drive
• commissioning

Economise happily:

• screen diagonal beyond what the helm and viewing distance justify
• advanced sonar you will not use
• a second display that shares power, network and GNSS with the first and is therefore not redundancy anyway
• brand-new-model premium where last season's platform meets the mission

#The best value spend on any boat

Three items, cheap on any budget, that improve safety more per dollar than any display upgrade:

1. A charged handheld VHF — independent battery, survives main-power failure, goes in the grab bag
2. A registered distress beacon, in date — see EPIRBs and safety equipment.
3. A tablet with offline charts, stored charged and disconnected — genuine redundancy, and it shares no failure domain with the vessel's network.

If a budget cannot stretch to the system you want, it can almost always stretch to these.

#Bottom line

Budget for installation and commissioning as seriously as for hardware, spend from power and sensors upward rather than from the screen down, keep what is still good, and design the network once. Do that and a modest budget produces a system that works — which is the only specification that matters at sea.