Author: Chang Choon Chiao
Date: 06-18-08 17:01
Sorry for not responding sooner. I shall try to offload some digital material on Olmec writing later, but here is some interesting snipet. Archaelogists claimed that the Olmec had discovered the properties of the lodestone and may have had the compass even before the Chinese, that is, if you take the dating of the earliest Chinese compass up to date to be actually the earliest Chinese compass.
It is possible that the earliest dated Chinese compass may be the latter versions. It is possible that the original version of the Chinese compass has yet to be found. That perhaps the Chinese had the use of the lodestone much earlier than the dated compass and had actually took this with them when they migrated to Central America. The Olmec also had jade carving of the fish, a typical Chinese artistic expression.
The above data was taken off the Wikipedia website.