ONC G-18

Product Description

Map No. G-18 in the ONC series: military topographic survey mapping covering the world's land masses & significant islands at 1:1, 000, 000. The maps are useful as general topographical coverage where nothing else is available, although they are designed primarily as flying charts for military aircraft. ONC stands for Operational Navigation Chart. Relief is portrayed by a combination of contours (basic interval 1000ft, intermediate contours shown where appropriate), elevation tinting & relief shading, plus spot heights. Towns, villages, major roads, railways & airports are shown but please note that many of the smaller settlements are not named & the road information is not necessarily up to date, as compilation & revision dates vary. Some air navigation information also appears on the map, such as radio beacons & restricted flying zones. Each ONC chart has both UTM & latitude/longitude grids overprinted on it, with additional margin ticks. IMPORTANT
- PLEASE NOTE: The series is gradually being withdrawn from sale to the general public & some sheets may no longer be available when ordered by us. Due to the nature of the map projection assembling these sheets to make a larger map is not recommended. in addition, colours used for relief are not constant throughout the series. In some areas of central Africa & South America the maps have blank spaces, reflecting localized deficiencies or inconsistencies in the survey data.