Know Waves

User's Guide

How to use the app, what each control does, and the terms that apply while you're using it.

Navigation warning

This app provides crowd-sourced marine information for informational purposes only. Conditions on the water can change rapidly, and reports may be incomplete, inaccurate, or out of date.

Always use official nautical charts, approved navigation equipment, weather forecasts, Notices to Mariners, and your own judgment when operating a vessel. Do not rely solely on this app for navigation or safety.

The app's developers and contributors are not responsible for any loss, damage, injury, or incident resulting from the use of this information. You are solely responsible for the safe operation of your vessel and compliance with all applicable laws and regulations.

01 Getting Started

Everything below is in the order you'd naturally run into it — set up your profile first, then reporting, then routes.

Profile & Float Plans

Under Menu → Profile & Float Plans, create an account with a valid email. Once logged in, float plans can be created and shared.

Report Observations

All users can see observations. Observations are archived every six hours and removed from the map. Login is required to report an observation.

A dashed border on a reported condition means it was pinned to a long-pressed spot on the map; a solid border means it was reported at the boater's own location at the time.

Weather, Sea Life, Debris, and Police each open a follow-up list to pick a more specific type (e.g. Sea Life → Dolphins, Fish, Sharks, Turtles, Whales, Manatees; Police → Coast Guard, Military, Fire Dept., Rescue Area). Other lets you type a short description, and both Other and Picture let you attach a photo or video.

NWS Alerts

Long-press anywhere on the map to check for NWS alerts and to report an observation at that spot.

Note: a long-press is also how you pin an observation's location.

Speed

Vessel speed is measured in MPH by default (tap the speed button to switch to knots).

Tracking

The tracking button shows the entire route and standard navigation view — see the Chart Key below for exactly what each icon means.

New Route

Tap and hold the map to add waypoints along your route. Remember to save your route when you're done.

Auto Route (Beta)

Under Menu → Auto Route, long-press the map to set your current location and destination — drag either pin afterward to fine-tune it. The app then computes a route between them automatically, opening it in Edit Route below so you can review it before saving.

Land-avoidance only for now — it doesn't account for water depth, your boat's draft, or channel markers, so review the route before relying on it.

Edit Route

Tap and hold the map to add a waypoint to the end of your route. Select a waypoint to move it. Tap along the route to insert a new waypoint in the middle.

Save Route

Save a route. Routes are stored on the iPhone, not in the cloud — they're unique to that device. (Cloud storage coming soon.)

Load Route

Load a saved route. Routes are stored on the iPhone, not in the cloud — they're unique to that device. (Cloud storage coming soon.)

Import Route

Import a route from Navionics

Go to Navionics → Select Route → My Routes Archive (or create an automatic or manual route) → Save it → Select Review and Share → Export GPX file → Select this app. The route will auto-load.

Share Route

Share a route or float plan with a crew member, contact, or anyone tracking your trip.

Auto Report (Beta)

In Settings, turn on Auto Report to have the app periodically suggest a condition report — using a smoothed wave-height average rather than a single snapshot — so you can confirm and post it in one tap instead of filling it out from scratch.

Wave-Height Chart (Beta)

While you run a loaded route, the app senses wave height and period from your phone's motion. When you arrive, it shows a chart of the whole trip — wave height plotted along your timeline, with the average, max, and min called out, a thumbnail of your route, and any conditions reported along the way marked on the same timeline.

For best results, the phone should be mounted to the boat near the helm, not bouncing around in a cup holder.

You can save or share the chart as an image. Tap Done to dismiss it (you'll be asked to confirm so it doesn't close by accident).

Tracks

Separate from the Tracking button on the map, Tracks (in Settings) records the path you actually travel while it's turned on, drawn as a thin dotted line rather than scattered breadcrumbs. Revisit or reload a past track from Tracks in Settings.

Use Show All in the top-right of the Tracks screen to toggle every saved track on or off on the chart at once, and Edit to select and delete several tracks in one pass.

Go Invisible

In Settings, Go Invisible hides your live position from other users on the map while you keep using the app normally — you just won't show up to anyone else.

Map Options

In Settings, choose which chart overlay shows on the map under Layers: Nautical Charts (NOAA), Leaflet (OpenSeaMap seamarks — buoys, lights, and channel markers), or no overlay at all. AIS Settings is listed here too, for a future release.

02 Chart Key

A key to the ten controls on the map screen that aren't self-explanatory on sight. Numbers on the mockup correspond to the entries at right.

■ Stop
No Alerts
☀︎71°
0.0MPH
⚠︎
100 ft
9:56
ETA
2
min
1.3
mi
1
2
3
4
5
6
7
8
9
10
Chart key
1

Tracking button

Tap to center on your location; tap again to see the whole route. Press and hold to turn the red heading line on/off.

2

Speed button

Shows current speed. Tap to switch units between mph and knots — also updates the ETA sheet's distance unit.

3

Tide chart

Live curve for the nearest NOAA station, with today's high/low. Tap to open the full tide detail view.

4

Alert button

Shows active weather alerts for your area at a glance — green means clear. Tap for the full advisory text.

5

ETA sheet

Drag the grabber up to expand — reveals nearby reported conditions, sharing, and your boat selection alongside live ETA/min/mi.

6

Report a condition

Log a sea-state observation at your position — waves, weather, debris, sea life, an authority sighting (Coast Guard, Military, Fire Dept., Rescue Area), a free-text "Other" note, or just a photo/video.

7

Weather attribution

The "Weather" mark and underlined Legal link under the temperature are Apple's required WeatherKit attribution. Tap either to view Apple's official weather data source and terms.

8

Wave height & period (Beta)

A live wave height/period estimate, side by side under the report button, based on how your phone moves while underway. Shown once motion access is granted (prompted automatically, like location).

9

Layers button

Shortcut to Settings → Map Options → Layers. Switch between Nautical Charts (NOAA), Leaflet (OpenSeaMap seamarks), or no overlay without leaving the map.

10

Scale legend

Shows real-world distance at the current zoom level, in feet, miles, or nautical miles to match your mph/kts setting.

03 Navigation and Safety Disclaimer

Effective Date: June 30, 2026

Know Waves ("the App") provides crowd-sourced information submitted by users regarding marine conditions, hazards, navigational observations, and related information. The App is intended solely as an informational aid and is not a substitute for official navigation resources or prudent seamanship.

No Navigation Warranty

Information displayed by the App may be incomplete, inaccurate, outdated, delayed, unavailable, or incorrect. Marine conditions can change rapidly due to weather, tides, currents, vessel traffic, construction, navigation aids, and other factors beyond the control of the App.

The App does not guarantee the accuracy, completeness, reliability, or timeliness of any information presented.

Not a Substitute for Official Navigation Resources

The App is not an official navigation system and must not be relied upon as the sole source of navigational information.

Users should always use appropriate official nautical charts, approved navigation equipment, Notices to Mariners, weather forecasts, tide and current information, and maintain a proper lookout while operating a vessel.

User Responsibility

You are solely responsible for:

  • The safe operation of your vessel.
  • Maintaining a proper lookout.
  • Exercising prudent seamanship and good judgment.
  • Verifying all information before acting upon it.
  • Complying with all applicable federal, state, local, and international maritime laws and regulations.

Crowd-Sourced Content

Content submitted by users is not verified by Know Waves before publication. Reports may be inaccurate, incomplete, misleading, duplicated, or intentionally false.

Know Waves does not endorse or guarantee any user-submitted information.

Limitation of Liability

To the fullest extent permitted by applicable law, Know Waves, its developers, owners, contributors, licensors, and affiliates shall not be liable for any direct, indirect, incidental, consequential, special, exemplary, or punitive damages arising out of or related to the use of, or inability to use, the App or any information provided by the App.

This limitation includes, without limitation:

  • Personal injury or death.
  • Vessel damage.
  • Groundings.
  • Collisions.
  • Environmental damage.
  • Property damage.
  • Financial loss.
  • Loss of profits.
  • Rescue or recovery expenses.
  • Any other damages resulting from reliance on App content.

Availability

Know Waves may be unavailable due to maintenance, network interruptions, equipment failures, software defects, or circumstances beyond our control.

We make no guarantee that the App will operate continuously or without interruption.

No Emergency Use

The App is not designed or intended for emergency communications or distress situations.

In an emergency, contact the appropriate maritime rescue authorities using approved emergency communication methods, including marine VHF radio where appropriate.

Acceptance

By downloading, installing, accessing, or using Know Waves, you acknowledge that you have read, understood, and agree to this disclaimer and assume all risks associated with using the App.

04 Support

Need help with the app, found a bug, or have a feature request? Get in touch.

Robert Klouda, Developer
rgklouda@comcast.net

See Acknowledgements for the data providers and services Know Waves relies on.