Now that the series 5 has a compass app you also might want to look a Pro Compass for the apple watch (.99Cents) and I personally find it to be accurate and precise and it's smooth. not bad to take a look at it.
Just so everyone is aware of that when I use the compass app supplied with my series 5 and using my Milanese band I have more issues with the magnet BUT when using the new Pro Compass app so far NO issues!
I bought Pro Compass for my S4 last week to use for walking/hiking until I spring for an S5 in December. It does require calibrating against a real compass, but that’s not a major issue.Pro Compass for Watch is one of the ones I was looking at last week, along with Big Arrow. I’m seriously thinking about getting Pro Compass for my S4. I’m not sure how well it will work, being that the S4 doesn’t have a magnetometer like the S5.