Laevakella kasutati pikkuskraadi mõõtmiseks/hindamiseks, võrreldes Greenwichi keskmist aega (GMT) taevakehade vaatluste põhjal kindlaks tehtud kohaliku ajaga. Selle väljatöötamine 18. sajandil oli märkimisväärne tehniline saavutus, kuna täpne aja teadmine pika merereisi vältel oli tõhusaks navigeerimiseks hädavajalik ajal, mil puudusid elektroonilised sidevahendid.
A marine chrometer is used to determine longitude by comparing Greenwich Mean Time (GMT) and the time at the current location found from observations of celestial bodies. When first developed in the 18th century, it was a major technical achievement, as accurate knowledge of the time over a long sea voyage was vital for effective navigation, lacking electronic or communications aids.
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