LANE SWIMMING IN OPEN WATER

Is it in a pool with walls but no roof: pool swimming. 
is it in a lake with a lane: OWS

I hoped to have the chance to improve the pool swimming with GPS.

Ok Thanks

Do you have any issues with the default pool swimming activity?

My 6+ years using Garmin's watches, since I do regular strokes, it always caught the actual distance.

I only swim in 25-meter pools, and I tried once or twice to use GPS, and it completely ruined the distance measurement.

If you want to do some drills, you need to use the drills option.

With that, you don't need GPS to pool swimming activities.

I thought  to avoid to use the Drill when in Open Water lanes.

stramenorca said:

I hoped to have the chance to improve the pool swimming with GPS.

Improve how? Distance wise it's much more easier to detect turns and add pool length to distance than it is to measure the same as GPS.