SeaMate: Marine Navigation

NOAA Charts, Tides & Safety

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Most of search and rescue is the search. SeaMate puts your exact position, a MAYDAY script, and man-overboard recovery one tap away. Free for 7 days. Most of search and rescue is the search. SeaMate is built around that one fact. Official NOAA charts and live tide data get you where you're going. The safety tools get you home. WHEN SOMETHING GOES WRONG • MAYDAY assistant — a complete distress call written out for you, with your exact position in degrees and minutes, ready to read aloud over VHF • Man overboard — one tap drops a mark, starts a time-in-water clock, and guides you back to it • Coast Guard contact lookup for the sector you're actually in • Float plan you can send to someone ashore before you leave the dock WHILE YOU'RE UNDERWAY • Anchor watch with a drag alarm loud enough to wake you • Bridge and overhead cable clearance checked against your air draft • Depth shading tuned to your vessel's actual draft • Route planning that checks every leg against charted hazards • Live NOAA tides, currents, and marine weather • Pre-departure checklists so nothing gets left on the dock • Voyage log with a recorded GPS track WHEN THE SIGNAL DROPS • Download full chart packs for entire coastal regions • Complete NOAA ENC vector charts for US waters • Everything keeps working with no cell service ASK THE CAPTAIN Plain-language passage planning. Ask about your route, the conditions ahead, an unfamiliar harbor, or what a chart symbol means — and get an answer that knows your boat and where you are. ONE PRICE. EVERYTHING INCLUDED. No tiers. No add-on chart purchases. No feature held back for a higher plan. Everything listed here is in the subscription. Try it all free for 7 days. Then $59.99/year, or $9.99/month. Price-lock promise: your rate never increases for as long as you stay subscribed. Built by a former search-and-rescue pilot, for the trip home. IMPORTANT — SeaMate is a supplemental aid to navigation. It is not a substitute for official paper charts, a properly installed chartplotter, a VHF radio, or an EPIRB, and it is not a guarantee of rescue. Always maintain a proper lookout and carry required safety equipment. Subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Payment is charged to your Apple ID at confirmation of purchase. Manage or cancel in Settings → Apple ID → Subscriptions. Terms of Use: https://www.risleetree.com/seamate/terms/ Privacy Policy: https://www.risleetree.com/seamate/privacy/

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Free for 7 days — try everything before you pay. New lower price: $59.99/year (was $69.99), or $9.99/month. SAFETY AND ACCURACY • Anchor watch now shows which way you have drifted correctly. The drag alarm itself was always accurate — it measures distance, not direction. • Route depth checks now use the shallowest charted depth on each leg, so shallow water that was previously missed is flagged. ROUTE PLANNING • Depth warnings now separate legs that are definitely too shallow from legs that only might be. • One warning per leg instead of one for every charted depth area it crosses. • Warnings clear as soon as you move a waypoint — including while you are navigating. • If you have not set your draft, SeaMate says so and shows charted depths without guessing whether they are safe for your boat. • Setting a waypoint as your route start no longer leaves a duplicate pin behind. ON THE WATER • Cross-track error reads in your chosen distance unit instead of thousands of feet. • The anchor drift indicator moves smoothly and reacts to smaller swings. • The chart no longer tilts into a 3D view by accident, and holds still while you drag a waypoint. ALSO • Tides now work offline. Download a chart pack and tide predictions come with it. • Distress calls use your saved vessel profile. Worth opening Settings → Vessel Profile to check yours is current. • The chart's draft picker shows the draft currently in effect. • Corrected artwork for shark species in the fishing guide.

The developer, The Rislee Tree Company LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Purchases
  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • User Content
    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
The Rislee Tree Company LLC
Size
73 MB
Category
Navigation
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Location
This app may use your location even when it isn’t open, which can decrease device battery life.
Languages
English
Age Rating
4+
In-App Purchases
Yes
  • SeaMate Monthly $9.99
  • SeaMate Annual $59.99
Copyright
© 2026 RisleeTree Studios