The Maneuvering Board (Pad of 50) is a pad of plotting sheets copied from the government maneuvering board chart 5090. Navigators use it to solve relative motion problems by hand: closest point of approach (CPA), another vessel's course and speed, and the course and speed needed to reach a new position.
At a glance
| Product |
Maneuvering Board, pad of 50 sheets |
| Based on |
Government chart 5090 (10-inch plotting diagram) |
| Sheets |
50, printed both sides |
| Sheet size |
About 13 x 14 in. |
| IMPA code |
370703 |
What's printed on each sheet
- A polar diagram with radials every 10 degrees
- Ten evenly spaced range circles, with the outer circle marked 0 to 360 degrees and reciprocal bearings inside it
- Scale bars of 2:1 and 3:1 on the left margin and 4:1 and 5:1 on the right, so one diagram works at different ranges
- A logarithmic time-speed-distance scale along the bottom
Problems it solves
- CPA, and the course and speed of a radar contact
- Changing station or passing at a set distance
- True wind from apparent wind, and the course for a desired relative wind
- Working several contacts at once
Who uses it
Deck officers and cadets learning radar plotting, naval and Coast Guard bridge teams, and anyone preparing for license exams that test relative motion. A pad lets you work each problem on a fresh sheet and keep the plot as a record of the watch.
