
To reset the altitude differential value to zero
| Altitude differential | In the Altimeter Mode, press E. | |
| • This will start altitude measurement. The | ||
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 | ||
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 | altitude differential value will show 0 after | |
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 | measurement is complete. | |
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 | • You must perform altitude differential | |
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 | measurement whenever you select format | |
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 | number 3 or 4 as the Altimeter Mode display | |
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 | format (page  | 
Using Altitude Differential Measurement While Mountain Climbing or Hiking
After you zero reset the reference altitude value at a particular location while mountain climbing or hiking, you easily can measure the change in the altitude between that point and another point.