Compass

A compass was a device that pointed to the north pole of a planet.

The First Doctor once used a power impulse compass taken from the Monk. (TV: The Daleks' Master Plan) He later used an electronic compass while on Tiro. (PROSE: Terror on Tiro)

In the 1900s, while on Fang Rock, the Fourth Doctor attempted to use a compass but found that a strong electrical field caused the needle to spin erratically. (TV: Horror of Fang Rock)

During the Fifth Doctor's quest for the Key to Time, one of its segments was disguised as a compass. (AUDIO: The Judgement of Isskar)

While shopping for presents for her TARDIS companions on 21st century Earth, Tegan found a compass that looked like a fob watch. When she realised some of her money was no longer in circulation, she stole it, rationalising that her future self would pay for it. (PROSE: Last Minute Shopping)

Jem's father had given him a compass with a treasure map hidden inside that lead the Sixth Doctor and Evelyn Smythe to Ruby Island. (AUDIO: Doctor Who and the Pirates)

Dalek seismic detector arms resembled compasses. (TV: The Chase)