Northrop Grumman Sperry Marine Jupiter, Operation And Installation Manual

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The JUPITER magnetic compass displays the magnetic direction and
provides heading information for the maritime navigation of vessels.
Only appropriately trained and educated personnel, familiar with all
mandatory safety and operating procedures, is allowed to operate it.
The direction can be read from the lubber line and floating compass
card.
With his fluxgate (sine/cosine) interface, the JUPITER magnetic compass
also provides direction data which can be addressed via the TMC func-
tion (Transmitting Magnetic Compass) to a Heading Management Sys-
tem (HMS).
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Although the JUPITER is a highly accurate magnetic compass for pro-
viding heading information, the operator must not rely on it solely as
the only heading information source. The plausibility of the JUPITER
heading information must always be confirmed against all other availa-
ble aids to navigation.