I did a short bike trip last night (about 18 miles) around where I live (near leeds) which I recorded on my garmin etrex vista
the garmin confirmed it was 18 miles and i "saved" the track

when I downloaded the track onto memory map the journey suddenley became 5,500km! all but the last 29kms was the leg from waypoint 1 to waypoint 2

the location of waypoint 1 was something like 0 degrees 00.000'S 0 degrees 00.000W – any idea what caused this?

i was able to get around this problem by converting to a track and then after lots of scrolling I was able to delete waypoint 1
is there another way of deleting waypoint 1 without scrolling to find it on the map?

This has hapened several times and becoming quite a nuisance
any suggestions how I prevent it?

thanks

You can open the gpx file in a text editor and delete the waypoint that way

if you save the route/track in .gpx format, you can open it with a text editor and remove the offending line – it's XML so reasonably obvious human-readable. Then reload the edited version.