Shared boats and small fleets
A family boat with three sets of keys, a partnership, a sailing club, or a small charter or rental operation. The problem isn't just the boat — it's coordinating the humans around it.
What can go wrong
When more than one person uses a boat, the gaps are between people.
Nobody's sure who was aboard last
Or whether the water was left on, the charger unplugged, or the hatch open. Shared boats accumulate small unknowns.
A guest needs to see, not touch
A renter or guest should be able to check the boat's state without being able to open the water or change settings.
Staff need control, owners need oversight
And nobody wants to hand around a single shared login with everything unlocked.
An incident with no paper trail
Something happens and there's no record of what led up to it — hard on a charter operation especially.
How Guardian covers it
Each risk maps to something that ships today, with the plan tier it needs called out honestly.
Real roles, not a shared password
Per-vehicle sharing with three roles: Full Admin (everything), Monitor & Control (view + operate), and Monitor (view-only — right for renters and guests). Invites go to an email address and are accepted in the app; everyone uses their own account. Inviting people needs a paid plan on that vehicle — Weekender shares with up to 3, Cruiser up to 10 — and being invited is always free.
One plan per boat, shared by all
The plan follows the vehicle, so a club or partnership pays once per boat and every shared user inherits its features — not per person. Ownership transfers cleanly when a boat is sold.
A record of what happened and when
The event log and history answer the "who left the water on" question: on-device always, hosted ~1 month on Weekender, ~3 years plus CSV export on Cruiser — the CSV is handy for incident reports.
Protection regardless of who used it last
The same safety model applies no matter whose turn it was: every valve open is volume/duration-limited, and the cloud flood shutoff works even when nobody's app is open, on every tier.
A whole fleet in one app
Multi-vehicle support lets one operator switch between boats in a single app.
The setup
Off-the-shelf hardware, bought once. The core app is free.
Recommended hardware
- Full build per boat — valve + Gateway, Flood ×2, Plus Uni, PM Mini~$235–260
- Shelly Plus H&T — optional cabin climate per boat~$30
- LTE gateway with GPS — per boat, for fleets that movesee guide
Hardware is per boat; the app is free. For a fleet spread across docks or lots, the connectivity guide covers cheap always-on links with GPS for location.
Recommended plan
Weekender per boat minimum — Cruiser for charter
A fleet wants at least Weekender per boat for fresher check-ins and the shared history that shows who did what (bilge and flood alarms and away push are free on every boat; the city-water valve rides each boat's plan). For charter or rental boats where SMS escalation (not live yet) and exportable history matter, Cruiser ($5/mo · $50/yr) per boat is worth it.
Each vehicle can start with one free month of Weekender.