Good to hear you are enjoying the site - welcome, gdead :)
Currently, laps mean laps direct from you Garmin.
However, there are a few new developments in the shorter and longer term pipeplines which might be of interest:
- in the shorter term, I'm looking to build a view which will allow you to view different splits within a single activity (I'll probably build this as an app - so if any app developers are interested, then please get in touch). You can already do this a bit in the Player view.
- in the longer term (which hopefully is only weeks or months) I'm thinking about some form of time trial/climb trial analysis which will automatically pick out some interested features. I need to think some more about this, but it feels very possible and feels quite exciting, especially for cyclists (I'd quite like the site to automatically pick out every time I've climbed up White Down - it could then remind me how fat and slow I've gotten!)
On combining multiple courses into one.... sorry, but you do know the answer already :) This isn't on the todo list at present - but I will keep building functionality and this may arrive one day!
Thanks again for the positive feedback

Welcome to the site!
Stuart
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