• Weather explainers: seventeen lessons from Bowditch on why the air moves, the major wind belts with the three circulation cells and the jet streams, air masses, isobars and pressure systems, fronts and the wave cyclone, ocean cyclone evolution, local winds, land and sea breezes, waterspouts and deck ice, fog, tropical cyclones and their hazards, a tropical cyclone encounter, Buys Ballot's law and the dangerous semicircle, maneuvering to avoid the storm center, and the general rules for a steamer. • Waves explainers: seven lessons on how wind makes waves, wave characteristics, the journey from the generating area to the coast, shallow water and breakers, measuring waves aboard ship, waves and ships, and tsunamis, storm tides, seiches and bores. • A ninth subject, Weather, on the home screen, with a rotating globe for the global winds and a three-dimensional sea for the waves.

• Radar explainers: eleven lessons on how radar works, gain, sea and rain clutter controls, range scale, pulse length, interference rejection, refraction and the radar horizon, ducting, diffraction and attenuation, with Bowditch citations. • Radar tuning simulator: adjust gain, STC and FTC on a poor picture and check whether weak returns survive. Illustrative receiver model, no score. • Shiphandling: how a propeller works, how a rudder works, pivot points with a live throttle, and twisting off a pier, on animated three-dimensional illustrations. • MOB recoveries: Anderson, Williamson and racetrack turns, each opened by its use case, with the track drawn for a casualty on either side. • Reduce Motion is respected in the new radar tuning simulator.

• Minor bug fixes from 2.0 • A redesigned interface with subject pages, clearer controls and a Resume row for the last activity opened. • Scenario Builder: place up to six contacts, edit their geometry, check the classification, and share the scenario by code or QR. • Vessel Identification: recognize ship classes and vessel types from silhouettes, photographs, or both. The feature is marked Beta and includes source credits. • New Aids to Navigation lessons and practice, including an animated view of a ship left of, on, and right of a range. • Updated interactive illustrations for position fixing, shiphandling, tides and currents, with clearer steps, fewer chart labels, slower current vectors and zoom controls. GPS shows the overlapping satellite range spheres. Squat uses a revised destroyer profile, an enlarged sonar-dome clearance view, and worked examples for clearance and speed through the water. • Clearer Star Finder labels, improved reference search, and a calculator that stays usable in smaller windows.

• A redesigned interface with subject pages, clearer controls and a Resume row for the last activity opened. • Scenario Builder: place up to six contacts, edit their geometry, check the classification, and share the scenario by code or QR. • Vessel Identification: recognize ship classes and vessel types from silhouettes, photographs, or both. The feature is marked Beta and includes source credits. • New Aids to Navigation lessons and practice, including an animated view of a ship left of, on, and right of a range. • Updated interactive illustrations for position fixing, shiphandling, tides and currents, with clearer steps, fewer chart labels, slower current vectors and zoom controls. GPS shows the overlapping satellite range spheres. Squat uses a revised destroyer profile, an enlarged sonar-dome clearance view, and worked examples for clearance and speed through the water. • Clearer Star Finder labels, improved reference search, and a calculator that stays usable in smaller windows.

- Redesigned home screen: Seven subject pages, Quick Access to your three most recent activities, and an iPad sidebar. Classroom remains on Home. - Star Finder: Identify selected navigational stars through the camera without using or storing your location. - Shiphandling lessons: Explore squat, bank effects, alongside interaction and passing-ship effects with animated graphics and live readouts. - Maneuvering Board: Open any of the nine problem types directly from its subject page. Practice generated problems or enter your own values. - Clearer lessons: Shorter instructions throughout, plus corrections to desired-wind explanations and recognition answers. - Playback and tide fixes: Improved pause, resume, replay and Finish controls. Tide lookups flag outdated results, and event-only tables no longer show misleading curves.

NEW FEATURE - Tides & Currents • Tide & Current Lookup. Station predictions for the United States (NOAA) and Canada (CHS), found on a map, fetched on demand, and kept for offline use. Tables and a curve you can put your finger on, exports for Excel and PowerPoint, and a plain statement of when the data was fetched. This is the one feature that uses the Internet — only when you ask, sending only the area and dates you ask about, to government services, with no account and no identifier. Everything else in the app still runs entirely offline. • How Currents Work. Three teaching pages with live water: the reversing current run as a transit of San Diego Bay on its real chart geometry, the rotary current turning through the compass on an offshore rose, and the hydraulic current in the Cape Cod Canal — two real bays out of step and the head between them driving the cut. • How Tides Work. The Moon's pull drawn in three dimensions: the uneven pull, the two bulges, the Earth spinning under them while the tide curve writes itself, the three tidal patterns, springs and neaps, what the chart datum means — and a moon dial you drag around her orbit to set the sky yourself. Every arrow and every bulge is computed from the physics, not staged.

Four new areas of training, and a pass over the app's own rules judgment. • Guided Practice. Rules of the Road practice that notices which rules you are weak on and draws more of them. Tracking is off until you switch it on, and the record stays on your phone. • OOD Math. The arithmetic a watch runs on: minute rules in your head, time-speed-distance, TVMDC, the 60-to-1 rule, visibility, doubling the angle on the bow, and anchoring circles. • Navigation Fundamentals. Zone time with an interactive zone map, ETA and speed of advance, and How Fixes Work — ten step-through pages covering visual, radar, soundings, celestial, GPS, running fix, DR, and set and drift. None of it is graded. • Chart No. 1 aboard. Every symbol, abbreviation and term, searchable offline, with the printed plates. • The GPS page is drawn in three dimensions, because the fourth satellite is what pins your altitude and a flat picture cannot show that. • Rules judgment: several hundred thousand generated scenarios were checked against the Rules themselves, and what that found is fixed — crossing ahead, the head-on boundary, what a report may claim about the maneuver it recommends, and which crossing pictures are dealt at all.

Everything CBDR does, now organized in a central hub. • Redesigned home screen. Every mode is one tap away instead of behind a menu — live scenarios, the moboard trainer, the rules test, and group testing each have their own place. • Multi-contact contact reports. When more than one contact carries risk of collision, the report now covers all of them: full information on each, the situation you are in with each, and a single course of action reasoned over the whole picture rather than one contact at a time. • The COLREGS are now browsable. The full Navigation Rules and Annexes, searchable, offline — no longer reachable only from a quiz question. Additionally, references to COLREGS are shown for wrong answers during testing. • "How CBDR Decides" explains the app's own reasoning, step by step, so you can check its work instead of taking it on faith. • Maneuvering board: work your own numbers in "Solve My Own", now its own destination. • A new title screen, and dozens of fixes to rules judgment, report wording, and scenario generation — including a rewritten risk-of-collision model reviewed with edge cases modeled from real bridge experience.