Features

Everything your boat needs you to know.

HullSense monitors every critical system on your boat — battery, bilge, GPS, weather, and tides — and delivers a daily Boat Health report to Pro subscribers every morning at 7 AM.

Free

Battery Monitoring

HullSense uses a 16-bit ADS1115 ADC to measure your battery voltage with precision that cheap voltage monitors can't match. Set your battery chemistry once and the app calculates an accurate state of charge every time.

  • Supports AGM, Flooded (wet cell), Gel, and LiFePO₄ chemistries
  • Automatically detects 12V, 24V, and 36V battery systems
  • Charging detection — shows Charging or Bulk Charging when on shore power
  • Charging readings excluded from history and health analysis automatically
  • Transmits over Bluetooth, WiFi, or LTE depending on what's available
Battery Monitoring
Battery screen screenshot
Free

Water Level Monitoring

A precision differential pressure sensor measures how much water is actually in your bilge — continuously, in real time. Float switches only fire when water is already dangerously high. HullSense watches the water itself, so you know about a leak the moment it starts.

  • Continuous water level measurement — not just whether the pump ran
  • Detects slow leaks that develop over hours or days, before any float switch would trigger
  • Alerts you immediately if water is rising and the pump isn't keeping up
  • Infers pump cycles from water level drops — no wiring required
  • The sensor never gets wet — a pre-attached silicone tube does the work
Water Level Monitoring
Water level monitoring screenshot
Free

GPS Location

The built-in GPS module gives you your boat's exact position. Whether you're at the marina or checking in from across the country, you always know where your boat is.

  • High-sensitivity GPS with 28dB gain antenna
  • Location displayed on a live map in the app
  • Works over Bluetooth locally, WiFi remotely, or LTE from anywhere
  • HDOP quality validation — only reports confirmed GPS fixes
  • Coordinates included in every data transmission
GPS Location
Map / GPS screenshot
Free

Weather & Tides

Local conditions matter on the water. HullSense pulls a 7-day forecast and NOAA tide predictions for your marina automatically — no setup, no API keys, always free.

  • 7-day forecast with high/low temperatures and precipitation probability
  • Current conditions: temperature, UV index, wind speed and direction
  • NOAA CO-OPS tide predictions — high and low tide times for all 7 days
  • Tide graph with cosine-interpolated curve and current time marker
  • Automatically localized to your boat's GPS position
Weather and Tides
Weather & tides screenshot
Free

Push Notifications

You don't have to be watching the app for HullSense to keep you informed. Critical events trigger an instant push notification to your phone wherever you are.

  • Critical battery alert — when voltage drops to a critical level
  • Low battery alert — early warning before you have a problem
  • High water alert — the moment water level rises above your threshold
  • Device back online — when your device reconnects after being offline
  • Geofence exit alert — when your boat leaves a defined zone (Pro)
  • Manage notification preferences from within the app
Push Notifications
Notifications screenshot
Free

Calendar

The in-app calendar keeps everything about your boat in one place. Add notes, set reminders with push notifications, and log trips manually — all organized on a month-by-month view accessible from the bottom nav.

  • Three entry types: notes, reminders, and trips
  • Reminders trigger a push notification at the scheduled time
  • Manual trip entries with date, notes, and custom details
  • Month view with dot indicators showing entry density per day
  • Tap any day to see a list of entries; tap an entry to view or edit
Calendar
Calendar screenshot
Pro

LTE Cellular

A Hologram eUICC SIM card is built directly into every HullSense device. Subscribe to Pro and it activates automatically — no trips to a carrier store, no plan to manage.

  • SIM7080G Cat-M1/NB-IoT modem built into the device
  • Hologram eUICC SIM — activated automatically on Pro subscription
  • Falls back to WiFi when available; LTE activates only when needed
  • Data usage is minimal — only compressed sensor readings are transmitted
  • Adjustable reporting interval: 5 to 60 minutes (locked at 30 min on Free)
  • SIM paused automatically if Pro subscription lapses
LTE Cellular
LTE / connectivity screenshot
Pro

Battery & Water Level History

See your battery over time and watch for water level trends. Gradual battery degradation and slow leaks are invisible in the moment — patterns only emerge when you can see months of data at a glance.

  • Battery voltage chart with 24H, 1W, 1M, and 3M time ranges
  • Water level history chart with pump cycle markers and event flags
  • 3 months of history retained for both battery and water level
  • Charging periods clearly marked and excluded from battery trend analysis
  • Export full battery and water level history as a CSV file any time
Battery and Water Level History
History chart screenshot
Pro

Geofencing

Draw a zone around your marina, mooring, or storage facility on the map. If your boat moves outside it, you get an instant alert — whether it drifted, dragged anchor, or something worse.

  • Draw a custom geofence zone directly on the map in the app
  • Instant push notification the moment your boat crosses the boundary
  • Alert cooldown prevents repeated notifications during a single exit event
  • Works anywhere in the world with LTE coverage
  • Geofence visible on the map alongside your boat's live position
Geofencing
Geofence map screenshot
Pro

Boat Health

Every morning at 7 AM, Pro generates a short report covering every system on your boat — so you always know what you're coming back to before you leave the house.

  • Battery condition: resting voltage trend, estimated charge, and chemistry-aware health rating
  • Bilge activity overnight: water level, pump cycles, and any rising-water events
  • Current location and connection status — confirmed GPS fix and last-seen time
  • 7-day weather outlook and NOAA tide times for the week ahead
  • Specific action items where something needs your attention — no noise when everything looks fine
Boat Health Report
Boat Health report screenshot
Pro

SMS Text Alerts

Push notifications require your phone to have signal and the app installed. A text message doesn't. When something critical happens on your boat, HullSense sends an SMS directly to your phone — no app needed to receive it.

  • Critical battery alert — text sent when voltage drops to a critical level
  • Low battery alert — early warning before you have a problem
  • High water detected — immediate text if water rises above your alert threshold
  • Geofence exit — text the moment your boat crosses its boundary
  • Enable and disable individual SMS alerts from within the app
  • Opt out at any time by replying STOP, or toggling off in settings
SMS Text Alerts
SMS alerts screenshot
Pro

Automatic Trip Logging

When you take your boat out, Pro logs the outing for you. A Cloud Function watches for GPS movement and automatically creates a trip entry with the route, distance, duration, and start and end coordinates — no tapping required.

  • Automatic detection — trip starts when GPS movement is detected, ends when you return
  • GPS polyline recorded for the full route and stored per trip in Firestore
  • Trip detail screen shows the route drawn on a Google Map
  • Distance and duration calculated and displayed for every trip
  • Start and end coordinates recorded for each outing
  • Free users can still add trip entries manually from the calendar
Automatic Trip Logging
Trip logging screenshot

Get more with Pro.

LTE cellular, history charts, geofencing, SMS alerts, daily Boat Health reports, and more — starting at $10/month.

LTE Cellular
Battery History
Water Level History
Geofencing
SMS Text Alerts
Boat Health
CSV Export
Automatic Trip Logging
See Pricing