a. make sure you start with the built in map program (unless you are z linux guru and have modified some files) then start mm
b. it appears (and a search nof the forum that howthe n810 is held makes a difference (w/the n810 logo up) you shnould receive a lock if ylu are outside in 2-5 minutes (for a 'cold' start).
c. make sure thd firmware is the latest and if necessary _flash upgrade
d. no way i am aware of selecting satellites