Possible Clues:

• Part of a G.P.S. reading: Abbr.
• Trop. of Cancer, for one
• Global positioning fig
• 50 degs., maybe
• Muscle exercised by doing chin-ups, briefly
• Relative of long.
• Iron pumper's muscle
• Certain parallel: Abbr.
• Like 2-Down: Abbr.
• Skeletal muscle