Ground proximity warning system
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Ground proximity warning system (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. Another common name for such a system is ground-collision warning system (GCWS).
Add to an aircraft
Add this code to your -set.xml file (above the </sim> tag), to make the GPWS operatable, set instrumentation/mk-viii/servicable to true.
<instrumentation> <mk-viii> <name>mk-viii</name> <number>0</number> </mk-viii> </instrumentation>
The MkVIII depends on many other systems, which must also be configured correctly, or it will behave unexpectedly.
Mode 6 (bank angle and altitude above field callouts) depends on a serviceable attitude reference, and ideally a valid decision height. /instrumentation/attitude-indicator/indicated-roll-deg is the key attitude property, which comes from either the attitude indicator (which is vacuum powered) or the master reference gyro (which is electrically powered).