Answering the demand for reliable, on-demand chart plotting tools, this guide highlights top online marine chart plotters suited for sailors, students, and professional mariners alike. Whether planning coastal routes, plotting bearings on paper charts, or training for certifications, these tools help translate charts into precise navigation. The selections emphasize durability, readability, and ease of use in real-world conditions. Best for: coastal cruisers, students preparing for exams, and crew needing accurate plotting tools on/off the water.
| Product | Best For | Key Benefit |
|---|---|---|
| Weems & Plath Marine Navigation Parallel Plotter | Traditional chart plotting | Durable, anchored to a marine-grade roller system with multiple scales |
| Liquidraw Portland Course Plotter with Protractor | Paper chart work | All-in-one plotter with protractor and sturdy brass divider |
| Part Synergy Marine Cartography Card | Regional navigation data | Pacific Islands coverage with SD/Micro-SD format |
| SimCoach Aviation Plotters | Aviation and nautical crossover | Rotating azimuth, WAC and sectional scales for mixed use |
| Medarchitect Aviation Plotter | Flight-style chart work | Eight functions with rotating azimuth for precision |
Weems & Plath Marine Navigation Parallel Plotter
The Weems & Plath parallel plotter is designed for durability and precise alignment on marine charts. It mounts on a marine-grade aluminum roller assembly and includes scales at 1:20,000; 1:40,000; and 1:80,000 to fit U.S. Coast and Harbor Charts. It also provides inch and nautical mile scales for versatile plotting. Best for mariners who prefer a traditional, fixed plotting setup with solid physical feedback. Limitation: focuses on fixed plotting accuracy rather than digital chart integration.
Liquidraw Portland Course Plotter With Protractor
This all-in-one marine navigation set blends a Portland course plotter with an integrated protractor and an 8″ brass divider. It’s ideal for coastal cruising, yacht training, ASA or RYA programs, and on-board chart plotting. The acrylic ruler has bold scale markings for easy readability, and the brass divider offers precise measuring with stainless steel points. Choose this if you want a complete, hands-on plotting toolkit for paper charts. Caution: brass components require care to avoid corrosion in salt air without proper maintenance.
Marine Cartography Card For Pacific Islands
This card-based marine cartography product targets Pacific Ocean island coverage. It uses SD or Micro-SD card formats to deliver Garmin Navionics+ style chart data for navigation. Best for users needing region-specific chart data with easy digital transfer to compatible devices. Better for digital chart integration than purely paper-based plotting. Limitation: depends on compatible hardware or readers to access the map data.
SimCoach Aviation Navigation Plotter
The SimCoach aviation plotter is a double-sided resin plotter with sections for aviation charts and WAC, offering resisting fade with clear printed scales. It uses calibrated distances for legal mile conversions and provides accurate distance and course readouts. Best for pilots who also navigate near-shore routes or sailors who require aviation-grade plotting accuracy. Caution: designed for aviation scales; cross-check oceanic chart needs for marine-only usage.
Aviation Plotter With Rotating Azimuth
The Medarchitect aviation plotter provides eight on-board functions with rotating azimuth and multiple chart scales, including 1:500,000 for Sectional, 1:1,000,000 for WAC, and 1:250,000 for Terminal Area. It withstands heat up to 60 C (140 F), making it robust for sun-exposed voyages. Best for pilots or navigators who need a compact tool with broad chart coverage. Limitation: primarily designed for aviation charts, which may require adaptation for traditional marine plotting.
Buying Guide: Choosing The Right Online Marine Chart Plotter
- Chart format compatibility: Decide between traditional paper charts versus digital/chart card data. If you rely on digital data, consider devices or cards that work with Navionics or similar formats.
- Chart scale and readability: Larger scales (e.g., 1:20,000 to 1:80,000) support detailed plotting; ensure the tool offers the scales you use most often.
- Durability and environment: Look for water resistance, corrosion resistance, and a robust frame for salt air and sun exposure.
- Portability and ease of use: For frequent travel or classroom use, lightweight, compact devices with clear markings are preferable.
- Integration with training: For students, a complete plotting kit with rulers, dividers, pencils, and notepads can be advantageous.
- Maintenance needs: Brass and acrylic components require routine cleaning to maintain accuracy and longevity.
- Budget and future-proofing: Consider whether a traditional plotting tool meets your needs or if you should invest in a device that supports future digital chart updates.
Frequently Asked Questions
- What is a marine chart plotter used for?
A marine chart plotter is used to plot courses, measure distances, and transfer bearings on nautical charts, aiding navigation on water.
- Should I buy a paper chart plotter or a digital chart tool?
Paper plotters are reliable when electronics fail or in traditional training, while digital-compatible tools offer dynamic chart updates and broader data access.
- Are rotating azimuth features necessary?
Rotating azimuth improves direct course readouts and is especially helpful for precise coastal routing and cross-track planning.
- Can these tools be used for aviation navigation as well?
Some tools are designed for aviation charts and can cross-apply to mixed navigation tasks, but verify chart types and scales before use.
- What maintenance is needed for brass and acrylic plotting tools?
Regular cleaning, dry storage, and gentle handling prevent corrosion and ensure legibility of scales over time.
- Do plotting tools require special training?
Basic plotting knowledge is helpful; many tools are designed for straightforward use, but formal training improves accuracy and efficiency.