Garmin BlueChart - Knysna, SA to Beira, MZ, JUL 08 (AF452S), Garmin Data 010-C0667-00
Changed this and the cable that attaches to the GPS unit;  all works very well now.  Before I changed these parts, i couldn't get my GPS to charge whilst map showing.  Hoping I get another coupla years, at least, from my GPS with these new parts.