CBDR
Radar & Rules of the Road
Free · Designed for iPad. Not verified for macOS.
CBDR trains junior deck officers and watchstanders in the core skills of the radar watch: contact evaluation, COLREGS classification, and the contact report.
• Live radar scope with relative and true vectors, trails, CPA, and time compression
• Generated scenarios: crossing, overtaking, head-on, Rule 18 hierarchy, traffic separation schemes, narrow channels, and restricted visibility — International and Inland rules
• Spoken or typed contact reports, scored against the correct report
• Maneuvering board instruction and drills: CPA, avoidance, stationing, true wind
• Recognition drills: navigation lights, day shapes, and sound signals
• 958-question USCG Rules of the Road test bank
• Offline group testing: host a test by QR code, collect scored results, and export a signable PDF or CSV record
Works entirely offline. No account, no ads, no data collected.
Ratings & Reviews
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.
The developer, Sean Bowman, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Sean Bowman
- Size
- 3.5 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Sean Bowman
