Does the inertial guidance unit need to be in motion to give a reading? Hey yeah, you could just drop it a fixed distance everytime you startup to calibrate it. :') BTW, what *are* those motors you are using to propel this thing, it looks a bit on the heavy side for the size of the drive units. Pretty cool. -Dal ----- Original Message ----- From: "Richard Prosser" > But would the detail of the local gravity be precise enough? Unless you are > flying significant distances, I would have thought that an "at rest" > reading prior to the flight would be sufficient to calibrate out the local > gravity offset. > Or I may be missing something. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu