I was discussing with a colleague the most efficient way to
store GPS positions for a logger device consisting of a GPS
receiver and a memory card. I suggested using a fixed point format
which would use 32 bits for Latitude and 32 bits for Longitude.
Another 32 bits is used to store time as the number seconds since
1/1/70 (a standard way for computers to store time). This fixed
point format will give the same precision as degrees and minutes to
3 decimal places (as Geocachers are used to). Each record would
take up 12 bytes as there are 8 bits in a byte. If the GPS position
was recorded once a second, a 1GByte memory card would last over
1035 days, plenty long enough we thought. Just think if you carried
this logger device with you all the time, your every move would be
recorded for nearly 3 years!
This cache's position has been encoded in the same way
- Latitude : 308102666
- Longitude : 1465608377
North and West are negative.
You can check your answers for this puzzle on
Geochecker.com.