CBDR

CBDR is a training app for junior deck officers. Twelve subjects cover radar, Rules of the Road, maneuvering boards, navigation calculations, positioning, tides and currents, shiphandling, vessel identification, weather and waves, maritime law, visual signals and testing. RADAR. Practice contact assessment, CPA, relative motion and contact reports. Use the scenario library or build a picture of up to six contacts to share by code or QR. Give a report by voice with on-device recognition, or type it. A Rule 17 drill stops the scope where the stand-on vessel must keep her course and speed, where she may act, and where she must. Eleven explainers and a tuning simulator cover the signal, receiver controls and propagation. RULES. Practice with the 954-question Rules of the Road bank and read the governing Navigation Rules passages in the app. Optional Guided Practice directs questions toward material that needs more work. Lights, shapes and sound-signal drills include their rules and explanations. MANEUVERING BOARD. Work nine Pub 1310 problem types with step-by-step constructions, including CPA avoidance, stationing, limiting range, bearings-only TMA, advance and transfer, and wind. Practice a generated problem, enter your own values, or print a problem set with blank boards and an answer key. CALCULATIONS. Work time, speed and distance, compass conversion, mental minute rules, visibility, anchoring, time zones, ETA and speed of advance. POSITIONING. Step through visual and radar fixes, soundings, celestial navigation, inertial navigation, GPS, AIS, the fathometer, running fixes, dead reckoning, and set and drift, with illustrated plots built step by step. Study aids to navigation with an animated range and recognition practice. Search the bundled Chart No. 1 plates. Star Finder identifies navigational stars from the camera's star pattern without asking for, computing or storing your position. TIDES AND CURRENTS. Animated lessons on tides, reversing flow in San Diego Bay, rotary currents, and hydraulic flow in the Cape Cod Canal. A separate lookup retrieves NOAA and Canadian Hydrographic Service station predictions, saved for offline use and export. SHIPHANDLING. Animated lessons show how a propeller and a rudder work, the pivot point, tugs, and twisting off a pier. Man-overboard recoveries step through the Anderson, Williamson and racetrack turns. Hydrodynamic lessons cover bank cushion and suction, interaction alongside an oiler, and squat, drawn with their pressure fields. VESSEL IDENTIFICATION. Recognize ship classes and vessel types from silhouettes, photographs, or both. This feature is marked Beta. Source and license credits accompany the images. WEATHER AND WAVES. Bowditch's weather on a rotating globe, from the wind belts and fronts to fog, tropical cyclones and Buys Ballot's law. Waves on a three-dimensional sea: how they form, travel, shoal and break. MARITIME LAW. Six pages from UNCLOS, SOLAS, MARPOL and STCW: where the rules come from, the maritime zones, passage rights, flag and port state, and warships and assistance at sea. Each step names the article it follows. VISUAL SIGNALS. Signal flags and pennants, hoists decoded from Pub. 102's examples, and Morse by light from a signal lamp or a ship at night. TESTING. Build a test from any topic in the app, with calculations as multiple choice or typed answers, questions from every explainer page, and questions of your own. Host and join group tests by QR or text code, entirely offline, and export the instructor's record as PDF or CSV. Print a test with its answer key. Hosted exams reveal answers after the test is finished. Training works offline. The station-prediction lookup uses the internet when requested, including Apple's map service. No account, advertising, analytics or tracking. Training settings, optional question-level practice progress, custom scenarios, saved tests and saved predictions stay on the device. There is no history of session scores.