Magellan MobileMapper Pro Manual page 4

7. Another work-around is to remove the SD card from the receiver, insert fresh
batteries and turn the receiver back on - without any card inside. Without an SD
card, the MobileMapper Pro receiver will record data to internal flash memory.
Because data corruption occurs only when writing to SD cards, not using a card
prevents data corruption. Assuming a 1 Hz logging rate and minimal
descriptions, there is enough flash memory in a MobileMapper Pro for about:
• 16 hours of real-time positions
• 2.7 hours of positions for post-processing
• 3.6 hours of reference station data
A more serious problem in not using a card is that if the receiver loses power
while a job is open, the entire job will be lost. Because battery life is affected by
ambient temperature, battery age, etc., it is extremely important to check the
remaining charge frequently by pressing the NAV button until you come to the
Satellite screen with its charge indicator at the bottom. Before the indicator says
there is one-quarter charge left:
• Close any open feature immediately
• Close the job
• Turn off the receiver
• Replace the batteries
Magellan Professional Avoiding data corruption problems with MM Pro SD cards Page 4 of 4