HARDWARE IDEAS
Navigation Protractor and Scale Rule (1/2 mill and 1/4 mill)
Extra-flexible; Lightweight; Large figures; Encapsulated print – can’t rub-off;
Inexpensive Protractors 5″(125mm) square. £1 each; p&p 50p. Five or more post free.
Scale rule (26cm long) reads to 35nm and 70nm; 2 for £1.50 including p&p.
Details and downloadable PDF to make your own.
Navigation Protractor and Scale Rule
These were developed for training youngsters in navigation planning as an inexpensive alternative to the rigid square protractor and scaling ruler.
If you wish, you can print and laminate your own using the PDF which can be downloaded from the link. The document is printed out on transparency film, then laminated to produce an accurate square protractor and scale rule for plotting courses on maps. There are two protractors and two scale rules to an A4 sheet.
Tips:- For best results, use a laser printer with laser transparency film, as some ink-jet transparency films leave bubbles when laminated.
• The scale rule is better printed on paper or thin card, so the scales show up clearly on the map.
• The 160 micron (2 x 80 micron) lamination pockets are adequate, but if your laminator works with 250 micron that might be a little better.
• The 160 micron sandwich cuts on a normal trimmer with a reasonably sharp blade.
Note:- The scale rule is not really stiff enough with the lighter laminating pouch to use to draw a straight line; a separate straight edge is helpful.