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BRIG. GENERAL D. L. WEART, (LEFT) OHIO RIVER DIVISION ENGINEER, CON- GRATULATES COL. B. B. TALLEY, DEVEL- OPER OF THE METHOD OF CHARTING IN- LAND WATERWAYS BY RADAR. COMPARISON OF RADAR MOSAIC (TOP) WITH STANDARD CHART OF SAME SECTION OF RIVER SHOWS ACCURACY OF NEW MAPPING METHOD. MAP-MAKING BY RADAR Rapid Preparation of River Navigation Charts through Method Developed by Army Engineers, Is Made Possible by Use of RCA's 3.2-Centimeter Radar Equipments PREPARATION of river navi- gation charts from radar pho- tographs assembled in mosaic form has been accomplished by the Army Corps of Engineers, Ohio River Division, using 3.2-centimeter radar equipment manufactured by Radio- marine Corporation of America. Col. B. B. Talley, Army Engineers Corps, developed the map-making method and conducted initial tests of the apparatus aboard the U. S. survey boat Cherokee. In making a radar mosaic, an automatic camera is attached to the radar instrument and adjusted to photograph images on the scope at regular intervals. The prints are then matched to produce a continu- ous strip-map reduced to the scale of standard navigation charts. On the assembled charts, engineers add dotted lines indicating the channel to be followed, together with fig- ures showing the depth of water, and brief identifying descriptions of important landmarks. According to Brig. General Doug- las Weart, Ohio River Division En- gineer, the importance of this de- velopment in chart - making is "comparable only to the introduc- tion of steam power on the river." Knoll's Position At All Times "By using radar and radar charts," General Weart said, "it is possible for a pilot to know exactly where he is and 'see' the obstacles before him regardless of fog—one of the bugbears of river navigation —or other soupy weather. Each image on the radarscope, whether showing an island, shoreline cliff, a building or a cluster of gas storage tanks, will be recognizable as though he could see the landmark itself." The cost of charting a river by radar, it has been pointed out, would be low in comparison to the savings that owners of Radio- marine 3.2-centimeter radar equip- ment could make through the gen- eral speeding-up of traffic and the elimination of delays due to weather conditions. The 3.2-centimeter super-high- frequency band on which Radio- marine radar equipment operates, gives sharp, clearly-defined images that are easily photographed from the radar's 12-inch scope by Colonel Talley's method. The high - fre- quency beam hugs the surface of the water and picks up buoys or other small objects over distances twice as great as those afforded by lower frequency radars of the type used in wartime. Two or more closely spaced objects appear on the Radiomarine radar scope as sepa- rate, distinct targets in their true relationship to each other. Locks, bridges, shorelines, channel mark- ers and approaching tows can be picked up by the radar. [24 RADIO AGE]