Weems & Plath Paralock Plotter

The Weems & Plath Paralock Plotter is a new parallel rule in a compact size that is particularly suited for use on modern small chart tables. The primary purpose of the Paralock Plotter is to enable the transfer of GPS positions rapidly, easily and accurately to and from any paper chart.

The Paralock Plotter features three unique design concepts:

A locking knob that allows the user to quickly plot a GPS position on paper charts. Two sets of finger holes that enable finger tips to act as friction pads on the underlying chart. Although shorter than standard size rules, opening to the same width as conventional rules and therefore covering the same chart area. The most inventive feature of this patented device is the locking knob located at one of the four pivot points of the rule's crossarms. This knob enables the two rulers to be fixed in any given separation which allows rapid determination of GPS position.