Hi, my name is Josh. I’ve been sailing since I was a child, and cruising with my family the last 7 years. I spend my days writing code, building and automating boats, and fixing things that break! I knew I needed powerful, unified technology tools to manage our cruising lifestyle,
so…
I asked myself...
How many cruising apps am I paying for?
no platform could say ‘yes’ to everything…
So I built Master’s Mate — and now the answer is YES!
Let’s build something extreme
Introducing the supercharged cruising toolkit
More powerful than your top 5 cruising apps — combined.
>{
N
Nav App
W
Windy
PW
PredictWind
Nv
Navily
SP
Sea People
}
It’s expensive, disjointed, and annoying to have to rely on 5 or more apps that don’t talk to each other to enjoy your cruising lifestyle. Master’s Mate was built by a cruising and tech extremist — and he didn’t hold back a single feature.
“There is a lot of dead air and lost features when you need to switch between apps. We have unlocked the power of unifying everything in one place!”
— Josh Youssef, Founder – July, 2025
The result is the most ridiculously feature-packed, yet easy-to-use cruising lifestyle platform ever built. And as a founding member, every Master’s Mate feature is yours for FREE — not for a trial, not for a year, but for as long as you sail with the Founder’s Circle.
While you live your story, Master’s Mate records it live!
Through the palms · GuadeloupeBuddies are what it’s all aboutNo two sunsets alikeFast friends — friends for life
Anchored under stars only reachable by boat. Friends made in places you couldn’t pronounce. Sundowners that turn into squalls that turn into stories.
The cruising life is too rich to live by scattered phone photos and a lost voyage log. Your voyage deserves a real log.
Friends back home stop asking “where are you?” — they just click follow and see.
Your kids in college track every passage.
Grandparents watch the grandkids cross an ocean — from the kitchen table.
One link. Every harbor. Everyone you love, along for the journey.
Search the largest public directory of vessels on the planet — by name, by flag, by home port. Your boat is almost certainly already in it. Claim her, and her page becomes your living home on the water — no other platform comes close.
Anse Mitan, Martinique. A beautiful anchorage at sunset — flat calm, glass on the bay, not a ripple in the cove. We turned in early, hatches open, the boat barely moving on her chain.
At 3:14 AM the Master’s Mate anchor sentinel went off — the kind of alarm that wakes everyone out of a dead sleep. I was out of the bunk before I was awake. We were dragging.
A 33-knot popup squall had rolled in from the east. Just enough to convince our 100,000-lb boat that now is a good time to leave.
I’ve been at anchor thousands of nights. No other anchor alarm has ever been as reliable and effective as Master’s Mate!
Real-time helm and full Vessel Control. Anchor watch that actually wakes you. Read and control Victron, NMEA 2000 & 0183, Modbus, MQTT, Shelly and CAN bus — every device on your bus, on every screen you own. Phone in the cockpit. Tablet at the nav station. Laptop ashore. Chartplotter at the helm. One login. Same data. Always live.
Live on every screen
AIS
Live Weather
Places
Target Tracking
Weather Routing
Replace it — or back it up
Your helm display — on the screens you already own.
A dedicated multifunction chartplotter runs $1,000 to $4,000 and stays bolted to one spot at the nav station. Master’s Mate puts the same live charts, instruments, AIS, and routing on every screen you already carry.
Replace it
Cockpit phone, galley tablet, laptop ashore — and a dedicated screen at the helm if you want one. No proprietary plotter to buy, nothing bolted to one bulkhead.
Save thousands
No plotter yet? You just saved thousands up front — plus $1,000+ a year in the app subscriptions it replaces.
Back it up
Already have an integrated plotter? MM runs independently, in parallel — full charts & AIS in your hand the day a plotter, MFD, or onboard network fails. An invaluable backup.
Replace your plotter, or run alongside it as your redundant second helm. One login, same data, always live.
Anchor Watch
Sleep through the squall.
The first time you actually trust your anchor watch, you sleep deeper than you have in years. Drift detection and a safe-radius circle that resets every time you swing. The whole alarm system is built right into Master’s Mate and runs on the boat itself — so it wakes everyone aboard with no cellular or internet connection needed. And the moment you drag, push alerts reach the captain and crew, even when they’re ashore.
More reliable than any standalone anchor-alarm app or $950 dedicated box — proven on a real cruising boat, not a lab bench.
Weather & Routes
Leave when it’s right. Arrive when you said.
Stack eight weather models side-by-side and route across all of them at once. Draw a route on your phone and it appears on every screen aboard. See your weather window, your tide window, and your daylight window before you weigh anchor.
Every passage, every anchorage, every harbor — logged automatically with the line you sailed, the time you spent, the notes you wrote at the helm. A year from now you’ll have a real story, not scattered phone screenshots.
Writes itself from your telemetry — no manual e-logbook app can match it.
Community
Keep your people. Meet the next ones.
See every AIS vessel around you the moment you arrive — who’s anchored, who’s underway, who’s leaving at dawn. Stay connected to the friends who sailed over the horizon last season without chasing them across Facebook groups. And as more cruisers come aboard, your fleet grows right along with you.
A real helm platform — not just a phone-only community app like NoForeignLand or SeaPeople.
Cruiser-Curated Places
Every anchorage. Reviewed by the cruisers who’ve been there.
200,000+ anchorages, marinas, and bars — curated by cruisers who actually dropped the hook. The bay with the wifi. The marina with the cheap fuel dock. The cove the locals say is safe to swim.
More places than Navily — and the only guide enriched by the fleet’s own GPS truth.
Enhanced AIS
Live AIS that remembers every boat you ever encountered.
The cargo ship coming up your stern at 18 knots. The squid boat dark on radar but lit on AIS. The buddy boat just over the horizon. Every target on your chart with closest-approach math — so you know which one to call, which one to dodge, and which one to wave at. AIS Memory™ remembers every boat you ever encountered… forever.
Does what MarineTraffic can’t — AIS plus identity, history and one-tap hailing.
And the rest of the kit — every one hardened on a real boat, out-gunning the app it replaces
Live
Live Instruments
Speed, depth, wind, heading, GPS — streaming to any browser, anywhere on Earth.
Beats cellular monitors like Siren Marine — full instruments, no monthly fee.
Live
Anchor Watch
Drag detection and geofence alerts built right into the boat — the alarm sounds aboard with no cellular or internet needed, and pushes to the captain and crew the moment you swing, even when you’re ashore.
More dependable than any standalone anchor-alarm app.
AIS Collision
Live AIS targets with CPA / TCPA math, range rings, and proactive collision warnings.
Collision math most chartplotters charge extra for.
Distress Network
One tap fires a Mayday to your whole personal network — family ashore, crew afloat — well beyond VHF range. As cruisers join the waters near you, it reaches them too. Help finds you faster.
Reaches rescuers VHF range can’t.
Live
Victron
Control
Cerbo GX, MultiPlus, Quattro, BMV, MPPT, Phoenix — full live telemetry, with inverter & charger control.
Full control — most monitors only read.
Boat Map
Watch your own boat on a live world map from any screen on Earth — and your friends’, whenever they’re sailing too. Share routes, follow voyages.
Cancel the expensive app that claims to predict the weather.
PredictWind charges up to $499 a year for routing built on weather models that are free to the whole world. Master’s Mate runs those same authoritative models* — GFS, ECMWF, ICON, GEM, UKMO and more — and routes your passage on them. Yours free.
*Master’s Mate does not run the PredictWind proprietary weather models.
8-model ensemble
Route across GFS, ECMWF, ICON, GEM, ARPEGE, UKMO, JMA & CMA simultaneously — and see exactly where the models agree before you commit.
Beats PredictWind’s paid two-model compare
True isochrone routing
Real isochrone solving with animated time-scrubbing and a passage forecast you can play forward, hour by hour.
The routing math the pros pay for — free
3,500+ boat polar library
Pick your exact hull while Master’s Mate builds your polars in realtime, so the route fits your boat’s real performance — not a generic average.
Routes tuned to your actual boat speed
Best time to leave
A departure matrix that lines up your weather window, tide window and daylight window before you ever weigh anchor.
Leave when it’s right, arrive when you said
🪙 Cancel your $499/yr PredictWind Pro subscription — this is yours free.
When seconds matter, the whole fleet has your back.
Master’s Mate isn’t only charts and weather — it’s a safety platform woven into your helm. Man-overboard, distress hailing, and instant alerts to the people who love you and can help you. Nothing else on the water puts all of this in one app.
Man Overboard
Press and hold — a pin drops the instant someone goes in. A bearing-and-range HUD guides you straight back while your crew is alerted at once. Escalate to Mayday with a single tap.
Live on every screen aboard
Distress Hailing
Broadcast Mayday, Pan-Pan or Sécurité to every nearby Master’s Mate boat and your whole personal network — far beyond VHF range. Responders coordinate assist, relay or stand-down in real time.
Reaches help VHF can’t
Your people, instantly
The moment anything happens, the people you chose — ashore and afloat — get the alert with your live position. No phone trees. No guessing where you are.
Where do I clear in with customs?Which marina has space tonight?Nearest chandlery for that part?Where can I provision before the crossing?Is this anchorage safe in a north swell?Where’s the cheap fuel dock?
200,000+ anchorages, marinas, chandleries, fuel docks, customs offices and provisioning stops — mapped, reviewed, and ranked by the cruisers who actually dropped the hook. Add the spots you love and earn Sea Miles for every contribution.
More places than Navily — and the only guide enriched by the fleet’s own GPS truth.
Cruising lives in scattered Facebook groups and WhatsApp threads that don’t know a thing about the water. Master’s Mate gives you real groups — public and private — right on the platform that already knows where every boat is.
SYDXJR+912 boats in Eastern Caribbean Cruisers
Live on the chart
DXDerek · Tobago Cays Raft-up off Petit Rameau Thursday? 🍹
Groups that know the map
Every group rides on the live chart — see members’ real positions, routes and anchorages. Something no chat app can do.
Build your own
Spin up a public group — a rally, a class association, a cruising route — and let anyone join you on the map.
Your community, your rules
Private crew & buddies
Private pods for your buddy-boats and crew: shared positions, routes and chat that never touch a public feed.
Find your people
Discover the groups already cruising your waters — and the boats in them — the moment you drop the hook.
Propeliu is how your followers back your voyage. Patronage apps take a brutal cut of every dollar your community sends you — Propeliu takes a tiny fraction, and lets you raise money for anything you need.
10–15%
Patronage apps
taken off the top of every pledge
~3%
Propeliu
card processing only — lower on ACH
One-time gifts, monthly support from your followers, or a full fundraising campaign with a goal and a story. Your audience is already watching you on the map — now they can help you get where you’re going.
⛵Refit for the Pacific crossing🔨Storm-damage repairs🚧New life raft & safety gear🎥Fund next season’s films⚓Help us re-rig
Your Founder’s Circle membership is more than software. It plugs you into our sister companies for real-world savings on just about everything your boat needs.
A wholesale account at MarineMaster.com
Founder’s Circle members get wholesale pricing on just about anything you could ever want for your boat — from ground tackle to electronics.
Wholesale pricing
Marina discounts from SuprataMarina
Exclusive member rates at SuprataMarina marinas — save on slips and services wherever your cruising takes you.
Member rates
After You Sign Up
Your first 60 minutes.
Three simple steps from sign-up to your boat live on the map. No salesperson, no setup call.
1
Pick your boat name.
yourboat.mastersmate.com is yours from minute one — your private home for instruments, anchor watch, logbook, and the public boat card you share with friends. Master’s Mate intelligently routes different user types to where they should go: visitors are encouraged to follow your boat, crewmembers are logged in with only the permissions they are given, and owners & captains get the run of the boat — stem to stern!
›boat.mastersmate.com
2
Connect your gear.
Plug a Bosun Box into your N2K bus and it’s done. Bringing your own gateway? Our setup guide covers NMEA 2000, 0183, VE.Direct, Modbus, and CAN — on any Linux, macOS, or Windows machine you already own.
3
Watch your boat go live.
Your instruments, your position, your anchor watch — streaming to every screen you carry. Arm anchor watch from the cockpit and walk away knowing the boat will wake you if she swings.
Do the math
What you’re actually getting for $0.
Most cruisers stitch this together from five or six separate subscriptions and a four-figure plotter. Founding captains get all of it — free.
Master’s Plan — every feature unlocked$299/yr
Multi-model weather routingvs. a dedicated routing subscription~$250/yr
Worldwide vector chartsvs. a premium chart app~$75/yr
Chartplotter hardware you don’t buyruns on the screens you already own$1,000+one-time
Real-world value, every year$1,600+
Your seat in the Circle$0
No credit card for bring-your-own captains. Leave whenever you like. Your seat stays free for as long as you’re in the Founder’s Circle — we’ll set public pricing later, once the platform has earned it.
Replaces Everything You Pay For
Cancel all of these.
This is the stack of subscriptions a typical cruiser pays for — every one of them replaced by Master’s Mate. Add it up, then cancel the lot.
What you’re paying nowevery single year, across six apps
$1,000+/yr
$0
All of it. One app. Free for as long as you’re in the Founder’s Circle. Public pricing for everyone who comes later gets set later.
The catch? There isn’t one.
So how can we do all this for free?
Simple: our founder is a cruising-and-tech extremist. He’d rather put something genuinely incredible in your hands for free than charge you for a promise that you might like it.
Most platforms make you pay up front and hope it works out. We’d rather prove it. Sail with the entire platform on us — every chart, every alarm, every screen, with no clock running. All we ask is that you help us make it better: tell us what breaks, what’s missing, what you’d change.
Prove the value first. Earn the renewal second. That’s the whole plan.
The Founder’s Circle
Your seat is free.
No credit card. No catch. No 30-day trial and no free-year countdown ticking down to a renewal notice. The full platform — every chart, every alarm, every screen — is free for as long as you’re part of the Founder’s Circle. We’re not VC-funded; we’re a small family running a real boat, so “free” actually means free. What we want back isn’t your card — it’s your voice: founding captains help shape what gets built next. Only 1,000 seats — and they’re going fast.
⚓ 1,000 seats only
🔥 Filling fast
🎁 Full platform free — no countdown
No credit card required
Leave anytime
Free for Circle members
1,000-seat Founder’s Circle
Before you choose a plan
Watch this before signing up...
Eight minutes on everything Master’s Mate does — and whether you’ll want the Bosun Box aboard.
Yes. Every Founder’s Circle member gets the entire platform free — every chart, every alarm, weather routing, the lot. Not a trial, and not a free year with a renewal notice waiting at the end of it: your seat is free for as long as you’re in the Circle. Bring-your-own-gateway captains don’t even need a credit card to start.
How can you give away this much for free?
Our founder would rather prove the platform is incredible than charge you for a promise. Founding captains are who we build it with — you sail with all of it, and you tell us what a real boat actually needs. That trade is worth far more to us than a subscription you’d resent.
Do I have to buy hardware?
No. Start 100% free on the phone, tablet or laptop you already own. Want full instruments and anchor watch? Use a Victron Cerbo you already have, build a DIY gateway for pennies, or grab a plug-and-play Bosun Box. Your choice.
What’s the 24-hour thing?
Founder’s Circle seats are limited to 1,000, so we reserve them for cruisers who’ll actually use the platform. To keep your seat, connect your gateway within 24 hours of signing up. Not ready to wire up a boat? Follow free as long as you like — a captain’s seat is for active boats.
Can my family and crew use it free?
Always. Followers — family, friends, armchair sailors — are free forever, no card, no catch. They log in to your boat with exactly the permissions you give them.
Do I have to leave my current apps and groups?
Not at all — keep whatever you like. But Master’s Mate finally gives you groups built for boats: public and private groups tied to the live map, so you can actually see where everyone is instead of guessing from a Facebook thread.
Will it replace my chartplotter?
It can. The same live charts, AIS, instruments and routing run on every screen you own — so you can replace a $1,000+ plotter, or run Master’s Mate in parallel as an independent backup for the day your hardware fails.
What happens when the beta ends?
The Founder’s Circle doesn’t get switched off at the end of it. As the platform grows, founding captains are the first aboard every new feature and the captains we lean on to shape it — that’s what the seat is for. Public pricing gets set for the captains who come later. Followers stay free, no matter what.
P.S. — one more thing.
Josh, Julie, Joshua & GriffinWorking together
We’re a real family of four on a real boat. Every feature in Master’s Mate started as something we needed — and we hope you will find Master’s Mate as useful as we have!
Founder’s Circle members sail free because we need your feedback and value you as a meaningful member of our community! We look forward to meeting you all online, or on the water!
Leave anytime · 1,000-seat Founder’s Circle · Software free for members, hardware optional
Master’s Plan
Apply for Founder’s Circle
A short, optional welcome from the Founder’s Circle — then claim your boat.
Watch the 45-second Founder’s Circle briefingOptional
Optional — you can apply below right away
Because you’ve placed your trust in us to purchase the all-in-one Bosun Box, you’re automatically accepted into the beta program. Fill out this short form so we can get to know you a bit better. You’ll get a purchase confirmation email right away, and an account-activation email once your Bosun Box ships.
or
Your details
✓ Signed in with Google
Pick your boat’s address
.mastersmate.com
No payment now · your boat’s name is held for you · immediate decision
