[[File:danger.jpg]]A '''“NAV” warning flag''' (as shown in the image above) will let you know that you should '''NOT''' trust the HSI indicator in the following cases:
[[File:danger.jpg]]A '''“NAV” warning flag''' (as shown in the image above) will let you know that you should '''NOT''' trust the HSI indicator in the following cases:
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* <span style="color:#0000ff">'''No waypoint'''</span> is selected for the instrument;
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* '''No waypoint''' is selected for the instrument;
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* The waypoint distance is <span style="color:#0000ff">'''over 250 nautical miles;'''</span>
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* The waypoint distance is '''over 250 nautical miles;'''
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* The <span style="color:#0000ff">'''GPS accuracy'''</span> is bad;
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* The '''GPS accuracy''' is bad;
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* Ground speed is <span style="color:#0000ff">'''less than 5 Kts.'''</span>
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* Ground speed is '''less than 5 Kts.'''
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<span style="color:#0000ff">'''Note:'''</span> Please note that you may still get correct deviation information when GPS accuracy is less than 2.5 nautical miles. In this case the compass card will be oriented to the north.
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<u>'''Note:'''</u> Please note that you may still get correct deviation information when GPS accuracy is less than 2.5 nautical miles. In this case the compass card will be oriented to the north.
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Revision as of 19:58, 13 October 2015
File:Danger.jpgA “NAV” warning flag (as shown in the image above) will let you know that you should NOT trust the HSI indicator in the following cases:
No waypoint is selected for the instrument;
The waypoint distance is over 250 nautical miles;
The GPS accuracy is bad;
Ground speed is less than 5 Kts.
Note: Please note that you may still get correct deviation information when GPS accuracy is less than 2.5 nautical miles. In this case the compass card will be oriented to the north.