Wirefish is a drag-and-drop wiring CAD program built for small to medium sized boats. Document your electrical and NMEA 2000 systems on your current boat, for a refit, or for new boat. Drag and drop premade components such as batteries, buses, NMEA 2000 backbone tees, ethernet wires and everything in-between. Save, export and print your system.
Easy to use premade components to drop into your project, or create your own.
AC/DC wire, NMEA 2000 cable, coax, and ethernet cables built in to easily design wire runs — all with 45/90° snap and bend points.
Backbone tees, terminators, power drops and an 0183 to 2000 gateway. Change color of tees to match your current brand cables.
Shapes tool allows you to make your own components and callouts.
Box-select and move parts, wires and notes as one or duplicate a whole circuit at once.
Ctrl+Z reverses anything, and autosave restores your session if Wirefish closes unexpectedly.
Any sheet from A4 to A1 with an editable title block — to a print-ready PDF.
One click redraws everything as black & white line-work for cheap printing.
A proper Windows app with a Start Menu entry and a desktop icon. No account, no internet needed, nothing phoning home. Projects are portable files you own.
Drop cables, power tees and terminators are all included — drag and drop to design your NMEA 2000 system.
Multiple port tees with brand color identification is built in.
Lite, Mid and Heavy
120Ω male/female terminators and field-attachable connectors.
An 0183↔2000 gateway plus a pre-labeled crossover block.
Backbone checklist, cable specs and a voltage-drop check.
Tally device LEN against your power-tee placement.
Easy to recognize components to drag and drop onto your drawing. If you don't see it listed, there is an option to make custom components. A black and white line only mode is also available for every component.
Battery
BATTERY SWITCH
ACR
Alternator
Solar
MPPT
MFD
GPS
VHF
Relay
Float Switch
CameraWirefish reads the finished drawing and totals it — so the buy list and the wire order come out of the diagram itself instead of a second spreadsheet you have to keep in step.
Print it as a clean data sheet with your own title block, or export CSV straight into a quote.
Set the sheet size, fill in the title block and watch the page build as you type. What you see in the preview is what comes out of the printer.
Both of these came straight out of Wirefish — the same boat, exported twice.
Full graphicsTabloid · 418 KB PDF Ink SaverTabloid · 289 KB PDFAfter purchase you download one installer and run it. Wirefish lands in your Start Menu with a desktop icon, the same as any other Windows program — no admin rights needed. It runs entirely offline, so it is right at home on a boat laptop with no signal.
No. One payment, one license, yours forever. Updates within the 1.x series are free.
DC power (batteries, selector switches, ACRs, alternators, solar/MPPT, chargers, inverters), NMEA 2000 networks (backbone, tees, drops, MFDs, GPS, AIS, radar, transducers, autopilot), NMEA 0183 equipment via the gateway and crossover terminal block, Ethernet runs, engines, comms (VHF), pumps, lights, float switches, relays, cameras, and more. You can rename and recolor any part, so it flexes to whatever's on your boat.
Yes — Export PDF lets you choose the paper size (A4–A1, Letter, Tabloid, ANSI C/D) and orientation, and edit the engineering title block — heading, drawn by, drawing number, revision, date — before it builds a print-ready PDF. An ink-saver black & white style prints the whole drawing as line-work with colors spelled out as labels. Save/Open also gives you a portable project file (JSON) so you can revise the diagram any time.
Windows 10 and Windows 11, 64-bit. Wirefish is a Windows desktop application — there is no Mac or Linux version today. A mouse or trackpad is the most comfortable way to draw wires.
Wirefish is a planning and documentation tool. It makes your intent unmistakable on paper, but sizing, overcurrent protection, and installation should always follow ABYC standards — when in doubt, have a certified tech review your plan.
Wirefish is a veteran-owned business based in Washington State. The software is written, tested and supported here — it is not white-labelled, resold, or built offshore.
It exists because documenting a boat's electrical system should not mean fighting general-purpose drawing software that has never heard of a bus bar, a terminal fuse or an NMEA 2000 backbone. Every component, every check and every printed sheet in Wirefish was made for that one job.