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| the GPI advances the known position by dead-reckoning; GPI advances the known position by dead-reckoning; the ground-position indicator advances the known position by dead-reckoning (the GPI advances the known position by dead-reckoning) | |||
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| the GPI advances the known position by dead-reckoning; GPI advances the known position by dead-reckoning; the ground-position indicator advances the known position by dead-reckoning (the GPI advances the known position by dead-reckoning) | |||