Orion Car Audio 420 - Manual (Page 28)

28 Orion 420 Weather Station
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Columbia Weather Systems, Inc.
North Alignment
To help with alignment, there is an arrow and text North on the bottom of
the transmitter. The transmitter should be aligned in such a way that this
arrow points to the north.
Wind direction can be referenced to true north, which uses the earth’s
geographic meridians, or magnetic north, which is read with a magnetic
compass. The magnetic declination is the difference in degrees between
the true north and magnetic north.
Compass Alignment
1. If the sensor transmitter is already mounted, loosen the fixing
screw on the mounting adapter.
2. Use a compass to determine that the transducer heads are
exactly in line with the compass and that the arrow on the bottom
of the transmitter points to north.
3. Tighten the fixing screw on the mounting adapter when done.
Once the sensor transmitter is aligned to north, the transmitter can be
removed from the mounting adapter without losing the north orientation.
Installing the Mast
There are three acceptable methods for mounting the mast to a roof or
building structure: Sloped roof mounting, flat roof mounting or wall
mounting. See Optional Sensor Mounting Hardware for more
information.