Hi from Sunderland

[SparkyFPV]

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Phantom 3 shows wrong altitude

Hi everyone im new to this group i met a gentleman today with a mavic air 2 who recommended me to ask the question on this site. I have a dji phantom 3 standard i know these drones are quite old but when the dji app says im at 400ft really im around 100 as the man paunched his drone to the same haight as mine so i could clarify my thoughts on something not being quite right. Any help on how to fix this issue would be well appreciated, thanks michael