- Navigation Aid, 2109 East Jensen Street, Mesa, AZ, 82513, USA, (tel) 480 834 9112. E-mail.
- Corrects compass variation, deviation, gives course to steer, converts relative to true bearings, gives reciprocals, non-electronic, circular slide rule, no pencil needed, durable plastic.
- Commercial Maritime>>Ship Chandlers
- Organizations, Clubs, Shows & Museums>>Organizations & Associations
- Publications, Books and Writers>>Books, Charts & Videos
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