HERE you will find Garmin’s website with FAQ for Oregon series.
How do I install a Micro SD card in an Oregon?
What options do I have for saving pictures on my Oregon 550/550t?
How do I turn off other mapping programs that I have loaded on my Oregon?
How do I lock the Screen on my Oregon?
Will my Oregon 550/550t record direction information at the time a picture is taken?Will my Oregon 550/550t charge NiMH batteries when the device is connected to a computer?
What is the largest memory card that the Oregon is compatible with?
To find the answer visit Garmin Knowledge Base (English): http://www.garmin.com/