I am using Skobbler Maps,
In the skobbler Framework I get all the instructions
-(void)routingService:(SKRoutingService *)routingService didChangeCurrentAdviceInstruction:(NSString *)currentAdviceInstruction nextAdviceInstruction:(NSString *)nextAdviceInstruction
In this delegate method getting all the instructions in around 5/10 meters and audio also playing. How can I customize turn by turn instructions and audio in each 100/200 meters.
You cannot do it (yet) as it connected to the routing engine & its settings and one would need to change the configuration file used by the routing engine - since this is currently done at C++ level there is no way for you to change this at SDK (Objective-C or Java) level.
The advices should normally be spaced nicely (it's the same in our navigation consumer apps) with distance - the only exception would be tight turns at high speed.
What routing profile are you using and which is the simulation speed?