tracker 500 plotter

i have just taken delivery of a boat with a tracker 500 plotter & c.map cartridge but there does not seem to be mutch info on the charts any info or advice would be greatly appreciated on using this

G' day from New Zealand
Your tracker 500 plotter may have been made by Navman
Marine Electonics.You can find them at www.navman.com
Regards
Pete