Suggest that you have a look at the following:. .. . <a href="http://www.ecacnav.com/files/TGL2REV1_.pdf" target="_blank">TGL</a> . .. .Its the requirements for flying in Basic RNAV airspace in Europe. BRNAV is applicable Europe wide, although the starting FL varies from country to country. <img border="0" title="" alt="[Roll Eyes]" src="rolleyes.gif" /> . .. .There are two specific issues that seem applicable to your case. Firstly (requirement) you need an RNAV system that is capable of storing at least 4 waypoints which can be updated as you fly to define your future route. Secondly if you are operating with an INS without updating you are subject to a restriction:. .. ."INS without a function for automatic radio updating of aircraft position [snip] may be used only for a maximum of 2 hours from the last alignment/position update performed on the ground.". .. .If you can't meet the requirements or your flight duration is > 2 hours you should file as non-RNAV and accept the restrictions that may/may not come with it. Strongly suggest that you get yourself a decent database.. .. .Take care.. . . . <small>[ 06 March 2002, 14:18: Message edited by: Never Lost ]</small>