Should you be one of those well-organised bush travellers you will pleased to know that GSP cables are now readily available from Gilsson GPS cables.
Using the highest UL-certified materials components, Gilsson GPS cables are produced and each component is custom manufactured to ensure a perfect fit with Garmin GPS units.

Some of the unique features include:

They have Designed for these models Garmin Nuvi, StreetPilot, Zumo GPS.
garmin nuvi 765,Garmin Nuvi garmin nuvi 260w, garmin nuvi 360, garmin nuvi 300 GPS 600 610 650 660 670 680 710 750 760 770, StreetPilot C510 C530 C550 C580 Zumo 450 550
By using this cable you can power and charger your Garmin simultaneously.
6 feet cable - inserts into GPS or GPS cradle.
The cables are of durable and high quality construction.
It is comparable to Garmin 010-10747-03 Adapter.
The cables are compatible Garmin GPS Receivers:
Garmin GPS Receivers:
Garmin Nuvi 600 610 650 660 670 680 710 750 760 770
StreetPilot C510 C530 C550 C580
Zumo 450 550 12V Vehicle DC Cigarette Lighter Adapter Power Cable Charge

Now that you have found your model and make that is compatible with Gilsson GPS cables, you are ready to head out in the African bush, safe in the knowledge you can power and charge your Garmin simultaneously.