Thanks for all the replies.

One more question.  The apple specs show maximum operating altitude of 10,000 feet.  If there is a good technical reason for this, it would seem rather limiting for our en-route use.  The operating temperature is also kind of pushing the upper limit when on the ground on hot summer days.  The temperature issue can be somewhat controlled, but the altitude exposure not so much.  Is this a CYA or other generic limit?

Environmental requirements

• Operating temperature: 32° to 95° F (0° to 35° C)
• Nonoperating temperature: -4° to 113° F (-20° to 45° C)
• Relative humidity: 5% to 95% noncondensing
• Maximum operating altitude: 10,000 feet (3000 m)

Chris Zavatson