The SPOT device has four reporting methods: Accounts can also be set up to send e-mail or text messages that This problem has not affected the simplex frequency.įigure 2-Anyone with access to a user's account can see where the user is on a The duplex (two-way) frequency used by Globalstar's phone/data service has experienced problems over the past few years because some of the electronics in the satellites have degraded. The SPOT device uses the simplex (or one-way) frequency of the Globalstar network to transmit messages. It runs off two AA 1.5-volt lithium batteries for about 14 days when it is in the tracking mode or it can send about 1,900 check-in messages. It is 4.38 inches long by 2.75 inches wide by 1.75 inches thick and weighs about 8 ounces. The SPOT device is waterproof, rugged, and self-contained. The device sends redundant messages to improve the likelihood that messages are sent successfully. Additionally, there is no way to know for certain that messages have been successfully transmitted. Messages are sent from the device to user accounts. The SPOT device provides one-way communication only. Each message contains the GPS location with a link to Google Maps displaying the location ( figure 2). Delivery options, e-mail addresses, and mobile phone numbers are configured on the user's account at the SPOT Web site ( ). Recipients will receive an e-mail message and/or a text message on a mobile phone. The SPOT enables users to send its GPS location and a preconfigured message using the Globalstar satellite system's simplex data network to designated recipients. It contains a GPS receiver and internal antenna and transmitter. The SPOT is a small, rugged, satellite-based personal messenger and GPS tracking device.
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