AN ACR CREW COMPLAINS OF AN UNCLR MODIFICATION TO THEIR CLRNC FOR TKOF WHEN THEY EXPECTED THE IDALE RNAV 1 DEP FROM LAS VEGAS; NV.

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DURING THE CLRNC ISSUED BY LAS CLRNC DELIVERY; NO INSTRUCTIONS FOR TKOF; EXCEPT TO EXPECT A L TURN TO 200 DEGS WAS GIVEN. MY FO ASKED IF WE WERE TO BE GIVEN A RWY HDG PRIOR TO THE TURN AFTER TKOF. THE GENTLEMAN ISSUING THE CLRNC STAMMERED AND THEN SAID YES; TO EXPECT THAT. WHEN WE REACHED THE END OF THE RWY FOR TKOF; THE TWR CTLR CLRED US INTO POS AND HOLD HE THEN TOLD US TO TURN L AT 2 MI TO HDG 200 DEGS; CLRED FOR TKOF. WE ASKED IF WE WERE TO FLY RWY HDG OR THE DEP TO THE 2 MI POINT. THE TWR CTLR STAMMERED AND SAID 'WITHOUT DELAY; CLRED FOR TKOF.' WE ASKED AGAIN IF WE WERE TO FLY RWY HDG UNTIL WE TURN; AND THE TWR CTLR SAID YES; FLY RWY HDG AND THEN TURN L; CLRED FOR TKOF WITHOUT DELAY. AS I LIFTED OFF; I REALIZED THAT I WAS UNCLR IF THE 2 MI POINT WAS 2 DME OFF THE LAS VOR; 2 MI AFTER TKOF; OR 2 MI ON THE DEP (IDALE 1); SO I GUESSED WHEN TO TURN AND DID SO. MY COMPLAINTS ARE: NOT BEING GIVEN COMPLETE CLRNC BY ANYONE (CLRNC DELIVERY NOR THE TWR). THE CLRNCS GIVEN ARE CONFUSING. SHOULD BE SPECIFIC ABOUT WHAT DETERMINES THE TURNING POINT. WE SHOULD EITHER FLY AN RNAV DEP OR NOT; NOT SOME HYBRID DREAMED UP BY LCL CTLRS. THE PLTS NEED TO BE CONFIDENT HOW TO SET UP THE INSTS (MCP; ETC); ESPECIALLY IN THE -300/500.