The BASIC ROAMER₅^©is suitable for use with 1:50,000 scale maps WORLDWIDE. In the British Isles we use Ordnance Survey, Landranger sheets (maps) of which there are 204 sheets, each sheet covers an area of 25 X 25 miles (40 X 40 Km). A series of vertical and horizontal numbered lines will be found on the maps, they are called grid lines and form part of the National Grid, which is based on an imaginary line, to the West of Lands End. Further to this, each 10 X 10  Km area has a two letter prefix, which enables a uniqueness when plotting a map reference.

Using THE BASIC ROAMER₅^© to plot and give a precise location is very easy, for example, see the diagram, which shows the THE BASIC ROAMER₅^©in the correct position to show map reference 186/693¹/₄619¹/₄, which is the Ordnance Survey, Landranger map number 186 and the reference we are using for this exercise. With the map open and laid flat to expose the top LEFT hand portion, find the vertical grid line 69 and the parallel grid line 61, place THE BASIC ROAMER₅^© onto the map, with the top RIGHT hand corner at the point of the grid square where the vertical line 69 joins the parallel line 61. Now move THE BASIC ROAMER₅^© along, towards the right (Eastwards = Easting) to a point which is 3¹/₄ tenths of the grid square from gridline 69, this will give you the first part of the map reference 693¹/₄ maintain this part of the plot, by holding THE BASIC ROAMER₅^© flat against the map, now slide it gently towards the top of the map (Northwards = Northing) to a point which is 9¹/₄ tenths of the grid square, this will give you the complete map reference, which is precisely in the middle of the road, between the two gate houses at the entrance to Stratfield Saye Park.

Although it may look very complicatied the design of  THE BASIC ROAMER₅^©  has been very carefully considered and has over 20 major features.

1. Precision Engineered
2. Exclusively based on the scale of 1:50,000 1¹/₄" to the mile
3. 5 Kilometres across (in scale!)
4. 2 miles deep (in scale!)

5. All information set parallel and is easy to read
6. 100 metre radius (cut out)
7. 200 metre radius (cut out)
8. 300 metre radius (cut out)
9. 400 metre radius (cut out)
10. 500 metre radius (cut out)

11. ¹/₁₀th of mile scale
12. ¹/₈th of mile scale (220 yds.)
13. ¹/₁₀th Kilometre scale
14. 12 and 24 hour clock face
15. Compass points/bearings (with 200 metre radius cut out)
16. ¹/₄ of grid square (cut out)
17. Degree angles (with cut out)
18. 100 yard scale
19. 1 nautical mile
20. Quick reference to Roman numerals
21. Hole for neck cord
22. THE BASIC ROAMER₅^© logo has been designed to remind you to plot a map reference in two segments, in order:-
1. > Easterly (from left to right)
2. _^Northerly (from bottom to top)
23. ¹/₂ tenths divisions of Kilometre scale
24. Average speed formula
25. Degree points to 360°
26. ¹/₆ mile divisions

1. Red ink on a white background
2. Black ink on a white background
3. Black ink on a clear backgound