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630 question - setting alert for half marathon

Apologies if this is the wrong place but there's no forum for the 630...

I recently got a second-hand 630 as I've just got back into running after many years - last watch I used was just "a watch".

The 630 is already set up so that it beeps and vibrates every 1km.  This is great as there are two loops from the door of my house - one which is almost 6km and one is almost 10km.  To do the full 6km or 10km I know I have to start a little up the road from my door and wait for the last km alert before hitting stop.  That way my route/time is recorded as 6km or 10km (not 5.9km or 9.95km).

I'd like to move up distance to a half-marathon but cannot figure out how to set that distance alert. I've figured out a route using an on-line map but it's not precisely a loop from my door - again, it's a bit short.  I could, of course, wait for the 21st km beep/vibrate and then run a bit more, but would like to have an alert at 21.1km so I don't under or over shoot.

Grateful for any easy to follow (!) advice.