What measurement unit or grid is this

What measurement unit or grid is this? I like to change the system of
measurment on my GPS so I do not have to convert when entering a coord that is
not in my usual hdd.mm.mmm format but this one has me foxed. It's from the USGS
topo maps so I would have thought it would be easy for me to figure out..

Tenas Lake lake        Mount Washington 47.504ºN        123.160ºW

http://72.14.253.104/search?q=cache:mAmDSlP9jN4J:www.topozone.com/states/Washington.asp%3Fcounty%3DMason+tenas+lake+mason&hl=en&gl=us&ct=clnk&cd=2

On Wed, 24 Jan 2007 21:24:51 -0800, in alt.satellite.gps nospam@nospam.com
wrote:



Ok I figured it out.. what a pain that was though and in the end I had to drop
the last number..

MinDec        47°30.203333        -123°9.676666

On Jan 24, 9:40 pm, nos...@nospam.com wrote:
.=2EOk I figured it out.. what a pain that was though and in the end I had =
to drop

to convert the dec. part of degrees to minutes, multiply the dec. part
by 60
60 times .504 =3D 30.24 not 30.203333 60 times .160 =3D 9.6
not 9.676666

SKM