My nav man will not charge or turn on why is this??

if the user manual has no information can you wifi that to a computer or get updates downloaded to the nav man ?
M-Nav 760 User Manual RoW.indd - Navmanhttps://www.navmanwireless.co.uk/wp-content/uploads/2013/.../m-nav760-manual.pd...

check their web site please, search for your model # & see if tis available

the sat nav plug is connecting the data link prong so thinks its connected to a pc. try another power cable.

Hi Graham,I had exactly the same problem with my Nav Man S50. After the icon of the lap top my screen went blank. I updated it via the soft ware provided but no updates were available. In fact the problem turned out to be the on/off switch. Although it was glowing red it was not charging. I simply placed a pen into the switch and it worked.
Hope this will help.
Maureen

The only other option is to dis-connect B+ power to the GPS system for 60 seconds in hopes it will reset the processor, before you hook the power back up press and hold the reset button for at least 60 seconds to bleed off any residual charge, If all this fails you should consider a replacement unit.

suggest a solution

white and blue is correct, white is signal, but be aware that manufacturers screw this up all the time, so try it both ways, and look for pulsing data on digital meter measuring 12V, should see meter jump rhythmically, from 0 to 4-12V. Confirm presence of data to maintain sanity

Evesham Nav-Cam 6200 turns on then sticks at the front page
( navigator, MP3 Photo, Setup) and won't go any further, tried
hard and soft reset but nothing happens. can you help.

Break in the cable - If you able to, try to locate the break and repair. you'll probably find it's at the usb plug end. Maybe easier just to replace it.