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ivac2:firdef_config_fir [2017/05/26 15:53] ian.beswick [Magvar] |
ivac2:firdef_config_fir [2017/09/02 19:40] (current) ian.beswick [Theme] |
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| ^Element ^Attribute ^Format ^Comment | | ^Element ^Attribute ^Format ^Comment | | ||
| - | |magvar |value|string |0 - 360| | + | |magvar |value|float |-180 to 180| |
| + | |magvar |value|string |"auto"| | ||
| + | Note that Magnetic variation East declinations are represented by positive numbers (rotated clockwise); West declinations are represented by negative numbers. | ||
| + | If you do not want magnetic variation to show in your maps (so magnetic north points straight up), you may use the "north" tag to indicate whether you wish true north or magnetic-north to show as straight-upwards at the centre of your FIR/preset. | ||
| + | If the string "auto" is provided, instead of a number, the FIR will automatically calculate the magnetic variation for each possible latitude/longitide in your FIR. | ||
| + | Note that FIR-wide settings for magnetic-variation may be over-ridden for each ATC or preset within the FIR; the above settings are used anywhere where the setting is not over-ridden. | ||
| + | //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".// | ||
| + | ===== North ===== | ||
| + | |||
| + | Default preset to load if not specified in atc.xml | ||
| + | |||
| + | |||
| + | ^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. | ||
| + | |||
| + | 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. | ||
| + | |||
| + | //The default setting is for magnetic-north to be upwards, and autorotation set true if not specified otherwise.// | ||
| - | Note that Magnetic variation is a West Declination; positive magvar will result in maps being rotated to the west (counter-clockwise). Think "West is best"! | ||
| - | If you do not want magnetic variation to show in your maps, apply a preset rotation of same angle as the magvar and they will cancel each other out. | ||
| ===== Preset ===== | ===== Preset ===== | ||
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| ^Element ^Attribute ^Format ^Comment | | ^Element ^Attribute ^Format ^Comment | | ||
| |theme |default|string |name of default theme | | |theme |default|string |name of default theme | | ||
| + | |||
| + | ===== Label ===== | ||
| + | |||
| + | Default SDD label to load if not specified in atc.xml | ||
| + | |||
| + | |||
| + | ^Element ^Attribute ^Format ^Comment | | ||
| + | |label |default|string |name of default label | | ||