18" Aluminum Arms Parallel Rule (Weems & Plath 138) Inner Seas of the West Coast of Scotland British Admiralty Nautical Chart 4929:

British Admiralty Nautical Chart 4929: Otter Passage to McKay Reach is a standard nautical chart

who initiated this era of discovery

published by the United Kingdom Hydrographic Office in 2018

British Admiralty Nautical Chart 705: Islands in Lakshadweep (Laccadive Islands) is a standard nautical chart

18" Aluminum Arms Parallel Rule (Weems & Plath 138) Inner Seas of the West Coast of Scotland British Admiralty Nautical Chart 4929:The 18 inch (45. 72cm) Aluminum Arms Parallel Rules feature aluminum arms that join two clear acrylic rulers enscribed with a protractor scale. An essential item in any proper navigation kit, these rules are used to plot direction on a nautical chart from any convenient meridian or compass rose. The two straight edged rulers are connected to maintain the same angle. By walking the rules across the chart and securely holding down the non moving ruler,