Latitude and Longitude Representations
Latitude and Longitude is usually reported in one of three formats, using degrees, degrees and minutes, or using degrees, minutes, and seconds. There are 60 seconds to a minute, and 60 minutes to a degree. Whichever of the formats is used, the smallest unit is often represented as a decimal.
Thus
47.89149246116762°, -121.65393948554993°
is the same as
47° 53.4895476700572′, -121° 39.2363691329958′
is the same as
47° 53′ 29.372860203432″, -121° 39′ 14.182147979748″.
To convert the decimal portion of degrees into minutes or the decimal portion of minutes into seconds, simply multiply the decimal portion by 60. To go up, divide by 60.
Update: I’ve written a little online converter here: http://ideaharbor.org/ll/.