The following are currently available. This list will be expanded in further updates to the apps.
Accuracy - The reported horizontal accuracy by your device of your GPS location.
Altitude - Taking your current GPS position, and looking up the height in the Anquet height data.
Compass Direction - (Only in beta on Android currently) - the compass direction as reported by your on-board compass. Please be aware that not all phones have an in-built compass.
Direction - This is the direction between the last two GPS fixes. So whilst a Compass Bearing (above) is the direction you are facing, Direction is the direction you have been walking in.
Distance - Distance travelled as recorded by your currently recording tracklog.
Grid Location - Your current GPS location, displayed in the format you have set in Settings->Coordinates.
Speed - The current speed reported by your GPS.
Time - Current time on your phone.
No Data / Clear - if you would rather not have data in one cell, select this to clear it.