Chartwork and navigation math trainer
ASA 101 is not a coastal navigation course, but a new skipper should understand nautical miles, knots, ETA, buoyage, safe water, and anchor-scope math before leaving familiar waters.
Speed, distance, time
Knots are nautical miles per hour. Fill any two values and calculate the third.
Bearing helper
Use reciprocal bearings for return courses, ranges, and simple anchor-drag checks.
Anchor scope
Scope is rode length compared with total bow-to-bottom height. Add water depth, bow height, and expected tide rise.
Current set and drift
Use this to see why current changes course over ground. It is simplified for training; real navigation needs a current table, chart, and local margin.
Mini chart drill
This is a simplified training sketch, not a chart for navigation. Use real, current charts and local knowledge on the water.
NOAA Chart No. 1 symbol scavenger
Identify beginner-critical chart cues: soundings, hazards, cables, restricted areas, anchorages, light characteristics, and chart-note warnings. This is a training sketch based on Chart No. 1 categories, not a real chart.
Visual route-planning challenge
Pick the safest beginner track from the chart sketch. The goal is not a perfect navigator's plot; it is building the habit of checking depths, aids, current, commercial traffic, and escape room before drawing a straight GPS line.
Saved chartwork drill
Run short navigation-math and chart-reading sessions. Scores and weak topics stay in this browser and feed readiness, progress backup, and final review.
Beginner chart-reading checklist
| Item | What to check | Why it matters |
|---|---|---|
| Scale | How much area the chart covers | A harbor chart shows hazards a small-scale coast chart may hide. |
| Soundings | Depth units, contour lines, drying areas | Your keel needs margin after tide, waves, and error. |
| Aids | Red nuns, green cans, preferred-channel marks, lights | They only make sense when you know direction of buoyage. |
| Hazards | Rocks, shoals, cables, restricted areas, wrecks | Do not route over danger just because the GPS line is straight. |
| Weather and tide | Wind direction, current, tide rise/fall | Navigation decisions change when wind and current oppose each other. |
Sources
- NOAA U.S. Chart No. 1 - chart symbols, abbreviations, and terms.
- NOAA Electronic Navigational Charts - current U.S. ENC overview.
- BoatUS Foundation Aids to Navigation - beginner buoyage explanations.
- BoatUS Foundation Anchoring and Mooring - scope and anchoring basics.