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The Portland Time, Speed and Distance Calculator (Small) offers precise navigation calculations in a compact format. Designed for skippers, students, and instructors needing a portable TSD tool on board.
Simple slide rule operation: Determine time, speed, or distance instantly from the other two values
Clear printed scales: Support quick checks for passage planning and position fixing
High-impact plastic outer sleeve: Built to withstand regular marine use
Compact size: Ideal for small chart tables and grab-bag navigation kits
NATO size option available: Match calculator size to your preferred working area
A practical, space-saving navigation aid for everyday coastal cruising and training.
