Reference chart
The exact 10×10 letter or mixed chart used for every coordinate.
Hart Chart Worksheet Maker
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ONE MESSAGE, ONE MATCHED SET
Three pages that cannot drift apart
Some online encoders output coordinates but leave you to find a separate chart. That is risky because Hart Chart layouts vary. This maker generates the reference, activity and key from one fixed layout.
Learner worksheet
Coordinates, answer spaces, directions and an optional name line.
Answer key
The same coordinate sequence with the decoded characters shown.
WORKED DECODER PACK
Worked decoder example: READ WITH A PARTNER
See how the maker turns a real message into a matched three-page decoding activity. This worked example encodes READ WITH A PARTNER across 16 coded letters and 3 word spaces using the matching reference chart (Chart ID: atlas-letters-v1). The reference chart, student worksheet and answer key share the exact same coordinates.
PAGE 1 OF 3 · REFERENCE
1. Reference chart
The matching reference chart (Chart ID: atlas-letters-v1) with rows A–J and columns 0–9. It must accompany the worksheet because other Hart Charts place letters differently.
PAGE 2 OF 3 · STUDENT
2. Learner worksheet
16 coordinate boxes organized by word with a student name line, standard directions and a 1-inch scale check line. The printable 3-page PDF formats coordinates into numbered word groups for clear decoding, while the PNG download displays horizontal word lines with spaces between words.
PAGE 3 OF 3 · INSTRUCTOR
3. Answer key
The instructor reference pairing each coordinate with its solved letter in red, verified against matching reference chart atlas-letters-v1, plus the full decoded message banner.
MATCHING COORDINATE SEQUENCE
Step-by-step coordinate table
Coordinates are matched to the reference chart (Chart ID: atlas-letters-v1). For READ, Row B Column 9 is R (B9), Row B Column 6 is E (B6), Row F Column 3 is A (F3), and Row F Column 0 is D (F0). Repeating letters use different cells on the chart, word spaces remain spaces, and the matching reference chart must accompany the worksheet and answer key.
READ
1
B9
R
2
B6
E
3
F3
A
4
F0
D
WITH
5
B5
W
6
A7
I
7
A4
T
8
C2
H
A
9
F4
A
PARTNER
10
B0
P
11
I0
A
12
C3
R
13
B1
T
14
A5
N
15
D0
E
16
E8
R
| # | Word | Letter | Coordinate | Row | Column | Note |
|---|---|---|---|---|---|---|
| 1 | READ | R | B9 |
Row B | Column 9 | First 'R' cell on chart |
| 2 | READ | E | B6 |
Row B | Column 6 | First 'E' cell on chart |
| 3 | READ | A | F3 |
Row F | Column 3 | First 'A' cell on chart |
| 4 | READ | D | F0 |
Row F | Column 0 | — |
| 5 | WITH | W | B5 |
Row B | Column 5 | — |
| 6 | WITH | I | A7 |
Row A | Column 7 | — |
| 7 | WITH | T | A4 |
Row A | Column 4 | First 'T' cell on chart |
| 8 | WITH | H | C2 |
Row C | Column 2 | — |
| 9 | A | A | F4 |
Row F | Column 4 | Second 'A' cell on chart |
| 10 | PARTNER | P | B0 |
Row B | Column 0 | — |
| 11 | PARTNER | A | I0 |
Row I | Column 0 | Third 'A' cell on chart |
| 12 | PARTNER | R | C3 |
Row C | Column 3 | Second 'R' cell on chart |
| 13 | PARTNER | T | B1 |
Row B | Column 1 | Second 'T' cell on chart |
| 14 | PARTNER | N | A5 |
Row A | Column 5 | — |
| 15 | PARTNER | E | D0 |
Row D | Column 0 | Second 'E' cell on chart |
| 16 | PARTNER | R | E8 |
Row E | Column 8 | Third 'R' cell on chart |
Hart Chart worksheet questions
What is a Hart Chart decoding worksheet?
It turns a message into row-and-column coordinates. A learner uses the supplied chart to locate each character and rebuild the message.
Are all Hart Charts the same?
No. Character placement differs between charts, so the generated reference chart must stay with its worksheet and answer key.
Can I include numbers?
Yes. Choose Letters + numbers before building the pack. The mixed chart includes A–Z and 0–9.
Does the message leave my device?
No. The pack is generated locally in your browser. There is no form submission, account or upload service.
Can I print on A4 paper?
Yes. Choose A4 or US Letter. The preview and export use the selected paper proportion.
Is this a vision test?
No. It is a printable activity builder, not a diagnostic or treatment tool.