In Africa you should get around 1.5-2m accuracy with a modern receiver which can also receive EGNOS DGPS corrections. Almost any modern GPS worth it's salt can receive these corrections, they are free, and transmitted on the same frequency as GPS, so you don't need any secondary antennae.
The US have now recently developed ways of degrading the signal in different parts of the world, I think there are a number of subtle ways of doing this, but not necessarily by skewing of the GPS clock.
Having said that, none of our customers are reporting any problems at the moment in Africa.
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In Africa you should get around 1.5-2m accuracy with a modern receiver which can also receive EGNOS DGPS corrections. Almost any modern GPS worth it's salt can receive these corrections, they are free, and transmitted on the same frequency as GPS, so you don't need any secondary antennae. The US have now recently developed ways of degrading the signal in different parts of the world, I think there are a number of subtle ways of doing this, but not necessarily by skewing of the GPS clock. Having said that, none of our customers are reporting any problems at the moment in Africa.