Navman no longer available in SA. The product is now called Northstar, and is identical to Navman. I had a problem with a Navman instrument which was replaced free of charge by Northstar, who are represented by M-RAD in Cape Town. They may have a used one, or a Northstar  equivalent. The person to speak to is Steve Revell, and the telephone number is 021 559-4003. He has assisted me a few times and offers excellent service. Hope this helps.

Roger