L1 Instructor Self Test Part 6 Badges.txt

A barograph or data recorder must be carried, in order to substantiate that a landing was not made at an intermediate point during the flight

For distances up to 100 km, the loss of height between the start altitude (at the departure point) and the altitude of the finishing point must not exceed 1% of the distance covered. For distances over 100 km the distance is reduced by 100 times the excess over 1000 metres loss of height

The arc of a great circle on the earth's surface joining given points defined by their geographical coordinates

3,000 metres (9,843 feet)

A flight over a straight course of 50 km (subject to 1% rule). Any leg of more than 50 km of a longer predeclared course may qualify, subject to the 1% rule applied over the whole course

Yes

There is no FAI ruling on this, but the pilot has broken the law and it is a debatable point whether an Official Observer should sign the application for a badge.

Yes

1 km

The so-called "observation zone" for turn-points is the airspace above a 90-degree sector on the ground with its apex at the turn-point and orientated symmetrically to and remote from the two legs meeting at the turn point