This app was mentioned in 1 comment, with an average of 1.00 upvote
I tried that and it was a bit limited. You couldn't edit it delete records, and the app itself kept the GPS on continuously.
I now use LD-Log, which has some nice sailing features, and allows custom recording intervals and export to GPX. It's paid, but I think it's worth it. I've been using it to record my sailing trip round the UK and had no problems over the last 2300nm.