A well made, solid and compact set of parallel rules with a locking knob - a clever adaption of the classic parallel rule design. They have been designed to transfer your latitude and longitude from the scale on the side of the chart to allow quick and accurate plotting of your position. They can also be used to derive waypoints from paper charts – particularly useful for electronic navigators.

All the features of standard parallel rules but fits in pocket and is easier to use. They may be compact and suited for use on small chart tables but the opening width is the same as standard rules.

·         The locking knob enables the two rulers to be fixed in any given separation which allows rapid determination of GPS position.

·         Two sets of finger holes enable finger tips to act as friction pads on underlying chart.

·         Has graduations – can be used as a protractor to determine compass bearing.

·         Has millimetre metric scale across bottom, making it easy to take distances and transfer them to mileage chart.