Arpin, P.E., foreword.FINDING THE SUN'S TRUE BEARING. PRECOMPUTED TABLES. Ottawa Civil Aviation Branch, Department of Transport Very Good 112 pp + blank pages for notes, oblong (7 15/16" H x 10 1/2" D). No date. Erratum sheet laid in. "From aviation's earliest days, pilots of aircraft have been conscious of the need for accurate directional information. The development of the magnetic and gyro compass has, for general purposes, kept pace with aviation needs in most areas of the world. Flight operations in Northern Canada, however, present problems which are unique by virtue of the position of the North Magnetic Pole. - - In response to a need for the provision of directional information simply and to within one degree the Flight Standards and Regulations Division of the Civil Aviation Branch has arranged the development of these tables from which the Sun's True Bearing can be extracted directly knowing date, correct Local Civil time (within reasonable limits) and approximate Latitude and Longitude. - - It is also significant to note that these Tables are not limited to Canada only, but include any areas of the earth north of 40 degrees North Latitude, and for all practical purposes will maintain usable accuracy for an indefinite period." From the Foreword. Interior - clean and tight with no previous ownwership marks. Exterior - small soiling mark on top of textblock, some very light rubbing/soiling on rear cover.