Marcum Technologies, Sonar, models:

Digital Sonar LX-i	Owner'S Manual
LX Series	User Manual
LX-3	User Manual
LX-3TC	User Manual
LX-5i	User Manual
LX-6s	User Manual
LX-7L	User Manual
LX-9	User Manual
LX7	User Manual
M Series	Quick Start Manual
MX 7 GPS	Quick Start Manual
VX-1P	User Manual
VX-1i	User Manual