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Charting Northern Waters celebrates the achievements and history of the Canadian Hydrographic Service (CHS) and examines a wide range of topics relating to the origins of the CHS and to its subsequent development. Topics include the colonial heritage of hydrography in Canadians waters, the politics behind the creation of the service, and the work of the agencies that were amalgamated with the Georgian Bay Survey to create the new national body.
Do you only have a week to spare? For those of us who are time poor but who want to seize the moment, either on our own boat or on a charter, it’s reassuring to know that there are plenty of cruising hubs from where we can enjoy some of the best of the region in only a few days. Imray Pocket Pilots are a new series of affordable PDF books, companions to the Yachting Monthly series A Week Afloat. They visit some ideal destinations and suggest a one week itinerary, and include expanded sailing directions for cruising each area based on printed Imray pilot books. Familiar Imray chartlets cover marina detail and approaches, and photos add both information and colour to the downloads. This Imray Pocket Pilot covers The Ionian, Greece.
Cormack demonstrates that geography was part of the Arts curriculum between 1580 and 1620, read at university by a broad range of soon-to-be political, economic, and religious leaders. By teaching these young Englishmen to view their country in a global context, and to see England playing a major role on that stage, geography helped develop a set of shared assumptions about the feasibility and desirability of an English empire.
Initial results of a continuing study to analyze and summarize the acoustically significant characteristics of the vertical sound-speed structure in the Indian Ocean are presented for purposes of acoustic model inputs and future exercise planning in the region. Data displays cover the western Indian Ocean west of 75 degrees E and north of 20 degrees S. Hydrocast data with computed sound speeds at standard depths provide the basic information to define areas of the Indian Ocean that are reasonably homogeneous with regard to sound-speed properties and can be summarized by a single profile for each season. Seasonal data presentations of bottom conjugate depth (the shallow conjugate of the bottom sound speed) and depth excess (water depth below the deep conjugate of the near-surface sound-speed maximum) indicate the primarily bottom-limited situation in the western Indian Ocean and identify the restricted areas of the Somali Basin with convergence-zone propagation potential. The upper-layer characteristics of layer depth, in-layer gradient, and below-layer gradient are displayed seasonally in contour format based on sound-speed-converted BT and XBT temperature data. Emphasis is placed on the significant effects of the seasonal monsoons, and in particular the strong SW Monsoon, on the near-surface structure. Results based on the two data sources are presented separately and some comparisons are made.