What does IGM stand for?

Gillman Marine Inc., Panama City, FL - Manufacturer code for watercraft hull identification number (USCG)

I Got Mine - Slang describing attitude of some nouveaux riches

Index to Geologic Maps (SAUO)

Inertial Guidance Mode

Instituto Geografico Militar - Military Geographic Institute (GIS)

Interactive Guidance Mode (NASA)

Intergalactic Medium

Internationale Gesellschaft fuer Menschenrechte - International Society for Human Rights - ISHR (EAIO)

International Geophysical Month (SAUS)

International Grail Movement (EA)

Internet Grateful Med - Program for assisted searching of MEDLINE (MELL)

Interplanetary Global Model - Marine science

Irma Graphics for Macintosh - DCA, Inc.

ISDN - Integrated Services Digital Network Gateway Module - Telecommunications

Iterative Guidance Mode - NASA

Kanggape - Language symbol (ETLW)

Kingman - Arizona - Airport symbol (OAG)