The TI-Voyage 200 combines all of the features of the TI-T89 but has an improved, larger screen, and has a regular typing keyboard. These functions are preferred by some people, but by no means are they required for celestial calculations. In both calculators, the StarPilot program is protected against loss in that it is archived in flash ROM permanent memory which means you can remove all 3 AAA (4AAA for V 200), and backup Lithium batteries without losing the program. World wide availability of the TI calculators means that your investment is protected by making it easy to replace the unit in the event of a mishap in a foreign port. Both calculators are the newest TI models and have a USB to PC interface built-in. They come with the TI Guide Book, the StarPilot illustrated User’s Guide with practice exercises on a CD with additional material and resources. TIT89 Calculator size is 3.2x7.1x0.75 inches. The TI-Voyage 200 is a little larger at 3.3x7.5x0.9 inches. SW 3 lbs.

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