OMISTAR 3-Piece Navigation Set — Parallel Ruler, Nautical Protractor & Fixed Divider, Clear Scales, Corrosion-Resistant

OMISTAR's 3 Pcs Basic Navigation Set is a compact collection of marine plotting tools — a transparent parallel ruler, a flexible nautical protractor, and a corrosion-resistant fixed point divider — built for precise chart work aboard or ashore.

Whether you're an amateur navigator learning coastal piloting or an experienced helmsman maintaining accurate dead-reckoning plots, this kit supplies the fundamental instruments used in traditional chart navigation. Each tool is made to be durable, easy to read and operate, and complementary so you can measure bearings, transfer courses, and mark distances without switching between disparate tools.

How do these instruments help with everyday chart plotting?

The parallel ruler makes it simple to transfer a course or bearing from one part of a chart to another while preserving angles. The protractor allows quick angle measurements and course plotting relative to true or magnetic north lines. The fixed divider converts chart distances to nautical miles or metric units so you can estimate leg lengths and ranges accurately.

• Parallel ruler: draw parallel lines to transfer bearings across a chart without re-measuring angles
• Protractor: flexible PVC face with clear degree markings for quick heading reads
• Fixed divider: corrosion-resistant metal and adjustable tension for repeatable distance marking

What features make this set reliable on a boat?

Materials and construction focus on visibility and resistance to a marine environment. The ruler’s acrylic is highly transparent so chart details beneath remain visible, and the protractor’s flexible PVC resists cracking. The fixed divider is metal with anti-corrosion treatment and a secure joint so it holds settings under repeated use.

• High-transparency acrylic ruler prevents blocking vital chart information
• Flexible PVC protractor resists impact and conforms slightly for snug placement
• Corrosion-resistant metal divider keeps calibration stable in humid conditions

How do I use each tool together to plot a course?

Start by using the protractor to identify your desired bearing relative to the chart’s north. Place the parallel ruler on that bearing and slide it to the vessel’s position to draw the course line without changing the angle. Finally, use the fixed divider to measure the leg distance on the chart and convert against the chart scale to determine nautical miles or kilometers.

• Measure bearing with protractor against chart meridians or compass rose
• Transfer bearing with parallel ruler to the vessel’s plotted position
• Measure distance with divider and compare to chart scale for range

How should I care for and store the navigation kit?

Rinse with fresh water after exposure to salt spray and dry thoroughly to prevent grime buildup. Store the pieces together in a dry case or compartment away from direct sunlight to avoid warping of the PVC and acrylic. Periodically check the divider’s joint for smooth tension and clean degree marks on the protractor for legibility.

• Flush with fresh water, dry fully, and avoid prolonged sun exposure
• Keep in a padded or separate compartment to prevent scratching of scales
• Occasionally lubricate divider joint and wipe degree markings clean

Who is this for: This OMISTAR navigation set is intended for boat owners, sailing students, instructors, yacht crew, and marine enthusiasts who prefer or train with paper chart methods. It’s also useful for navigation classes, coastal cruising, and as a reliable backup to electronic instruments when practicing traditional plotting techniques.