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Navigational Tools 15" Folding Parallel Rule details $12.95 360° (3")-Compass Protractor with Arm details $3.95 Bow Compass - DI-26 details $14.95 Course Protractor Plotter Ruler details $8.95 Divider - DI-34 details $11.95 Parallel Glider details $21.95 Time-Speed-Distance Disc Calculator details $7.95
