Orbcomm Inc. (Nasdaq: ORBC) is buying System Planning Corp.’s globaltrak division, which uses satellite communications networks for logistics and security.

Arlington, Va.-based Globaltrak’s customers include the military, government and commercial customers.

Orbcomm also bought Mobile Net Inc., a Milton, Ga. company that uses satellite and cellular technology to monitor equipment for the rail industry. Terms of both transactions were undisclosed.

Orbcomm, headquartered in Rochelle Park, N.J., is a satellite data communications company that specializes in machine-to-machine communications. The company expects the globaltrak deal to expand its services to the transportation market.