Finished last two blocks of ELT mag survey (1B and 1C). Mag data file is 13sstlmt.wg. After lunch I started to lay out another 1ha grid on the eastern side of the fortress where a series of three terraces lead up to what I think is a lower gate to the fortress. It's difficult to see this area from Benchmark A and Benchmark B, so I tried to resection to my initial occupied point using Corner 1 point from the SLT,ELT grid and ELT point 38 but I kept getting error messages from the data collector saying that it didn't have enough data to make the resection calculation; I think the angle was too acute to create a calculation for the occupied point. Tomorrow I'll just have to set up on SLT/ELT point 1, backsight to BM B and take a sideshot to my initial baseline point in the new grid.