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ivac2:firdef_config_fir [2017/09/02 17:31] ian.beswick [Magvar] |
ivac2:firdef_config_fir [2017/09/02 17:58] ian.beswick [North] |
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| //To convert from a true bearing to a magnetic bearing you deduct the magnetic-variation. If it is a west declination you are deducting a negative number which is the same as adding. For an east declination you are deducting the variation. | //To convert from a true bearing to a magnetic bearing you deduct the magnetic-variation. If it is a west declination you are deducting a negative number which is the same as adding. For an east declination you are deducting the variation. | ||
| To put it another way "West is Best. East is Least".// | To put it another way "West is Best. East is Least".// | ||
| + | ===== North ===== | ||
| + | |||
| + | Default preset to load if not specified in atc.xml | ||
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| + | ^Element ^Attribute ^Format ^Comment | | ||
| + | |north|value|string|"mag" or "true"| | ||
| + | |north |autorotate|boolean|"true" or "false"| | ||
| + | |||
| + | Allows FIR-wide choice between magnetic-north upwards or true-north upwards; map projections from polar lat/lon coordinates to flat screen coordinates mean that this will only be correct at the middle of the FIR or preset. | ||
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| + | If autorotate is set "true", north upwards will apply at the centre of each preset. | ||
| + | If autorotate is "false", presets will NOT be automatically rotated; instead, the map will stay in the default orientation for the whole FIR, which will typically be with true-north pointing upwards at the centre of the FIR. | ||
| + | This setting will make little difference for FIRs at equatorial/tropical latitudes, but for FIRs with higher northerly or southerly latitudes the map projection means that north changes direction on-screen either east or west of the middle of the FIR/preset. | ||
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| + | //The default setting is for magnetic-north to be upwards, and autorotation set true if not specified otherwise.// | ||
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| ===== Preset ===== | ===== Preset ===== | ||