BoatTender Get the launch email
Friends relaxing on a pontoon boat in a quiet cove at golden hour, wooded hills behind

Free · Coming to iPhone and Android

Read the lake before you leave the dock.

Boaters mark the hazards, and you see them on the map. Find marinas by Fuel or Open now, and check the NOAA forecast.

report types
9
from tap to posted
5 s
marinas saved for search with no signal
76
BoatTender's map while under way on Norris Lake: your boat heading toward Shanghai Resort Marina, with boaters' reports pinned nearby: debris, a patrol sighting and a no-wake zone
App screen, composed from the Sep 25 test build
Report sheet with nine choices: Hazard, Patrol, Collision, Congestion, No-wake, Weather, Closure, Fuel price and Map issue.
App screen, test build, Sep 26, 2026

01Reports

Nine things boaters report.

Tap Report, then tap what you see. The pin drops at your boat and posts in 5 seconds. Boaters tap Still there or Gone, and old reports fade.

  • Hazard
  • Patrol sighting
  • Collision
  • Congestion
  • No-wake zone
  • Weather
  • Closure
  • Fuel price
  • Map issue

Community reports, not for navigation.

A pontoon pulling two kids on a tube across the lake, spray in the air

Flag your boat

Towing a tube? Flag your boat, and boaters near you see it on their map.

A pontoon easing into a covered marina slip at dusk, dock lights glowing
Shanghai Resort Marina's page in BoatTender: a photo of the harbor building, covered slips and hours, amenities and a Call button

App screen, test build, Sep 27, 2026

02Marinas

A marina's page: slips, hours, amenities and a Call button.

Tap a pin or search by name. With location on, the nearest marina comes first.

Filters in the app

  • Open now
  • Offers boat slips
  • Fuel
  • Short-stay visitor slips

Listings come from PierAuthority's marina registry.

03Before you go

Forecast, anchor alarm, no-signal map.

Early morning at a marina fuel dock, mist lifting off the lake

The forecast

The NOAA forecast for the area on your map: air, wind, sunrise and sunset.

A family swimming beside an anchored pontoon in a quiet cove

Anchor watch

Set 50, 100 or 200 ft, and the alarm sounds if the boat moves past it. It may not sound on silent, so keep checking.

Norris Lake drawn in BoatTender's map colors, with a dot for each saved marina

No signal

Map areas you viewed recently stay on your phone. Posts send when you're back in coverage.

BoatTender's map with a cove on Norris Lake shaded and named Mickey Mouse, shared with the crew: Angie and Steve 1 inside the cove, your boat on the river, and a card to meet them
App screen, composed from the Sep 25 test build

04Your crew

Find your friends.

Outline a cove, give it a name, and share it with your crew. See who is already there and send a beep. Go invisible any time.

A woman at the helm of a pontoon, a phone in a dash mount beside the wheel
BoatTender's Friends list: Angie and Steve 1 at Mickey Mouse, Lucas BFF underway, Hoffer docked at Shanghai Resort Marina, a Beep button on each, Harper and Isaac not out, and the Add a friend button

App screen, composed from the Oct 1 test build

05Friends

Add a friend. See when they're out.

When a friend shares their position, you see when they're on the water and where. Send a beep, a one-tap wave.

Go invisible and you still see every report and boat. Nobody sees you.

Friends need a free account. The map doesn't.

A BoatTender push notification, Patrol ahead, over the Notifications screen with its switches for friends, beeps, report alerts, marina events and deals
App screen, composed from the Oct 1 test build

06Alerts

Hazards ahead find you, even with the app closed.

Report alerts push a hazard ahead to your phone while you're underway, even when BoatTender isn't on screen.

Turn on Friend underway nearby, and you know when your crew is out. Marina events and deals are off until you want them.

Severe weather and safety warnings are always on. They can't be muted.

Not for navigation

BoatTender shows community reports. It is not a rescue or navigation tool. Carry charts. In an emergency, use VHF channel 16 or call 911.

Free. Coming to iPhone and Android.

It isn't in the stores yet. Leave your email and we'll write once, when it is.

Run a marina?

Listings come from PierAuthority's registry. Email us about your listing, or about a BoatTender QR code for your counter at launch.

Email us