World-wide Topographic Map Series - ONC

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Military topographic survey mapping covering the world's land masses and significant islands. ONC stands for Operational Navigation Chart. These maps are designed primarily as flying charts for military aircraft, but they are useful as general topographical maps where nothing else is available.

Relief is portrayed by a combination of contours (basic interval 1000ft, intermediate contours shown where appropriate), elevation tinting and relief shading. Spot heights are also given. Towns, villages, major roads, railways and airports are shown but please note that many of the smaller settlements are not named, and the road information is not necessarily up to date, as compilation and revision dates vary. Some air navigation information also appears on the map, such as radio beacons and restricted flying zones.

• IMPORTANT - PLEASE NOTE:
  - In some areas of central Africa and South America localised deficiencies or inconsistencies in the survey data at the time of compilation of these maps has resulted in little or no elevation shown or even blank spaces with no detail at all.

- Due to the nature of the map projection assembling these sheets to make a larger map is not recommended. The colours used for relief are not absolutely constant throughout the series.*