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单选题
A line of position derived from a loran reading is a section of a(n) （）.
A
straight line
B
arc
C
parabola
D
hyperbola
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circle of equal altitudeB
parallel of declinationC
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单选题A line of position derived by radar range from an identified point on a coast will be a(n) （）.A
straight lineB
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单选题Which signal is detected as originating from a SART?（）A
The Morse code distress series S-O-S repeated 3 times followed by DE and the vessel's call signB
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relative bearingB
range lineC
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a line on some point of which the vessel may be presumed to be locatedC
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estimated positionB
assumed positionC
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Focus lineB
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单选题The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.A
on loran charts covering areas where sky waves are usedB
in the Radio Aids to Navigation，PUB 117C
in the Loran-C Correction TablesD
Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
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