Ouan
Member
menacer said:There are a lot of reasons why your error may have been such, but one particular thing to note, when using a disto with a regular compass clino or a pony, is that the battery from the disto will cause a magnetic shift when placed next to the compass/pony.
Wave a battery over your compass/pony and coo in awe at the swaying needle/digital reading....
Its not a major problem , just keep the disto and the compass away from each other when taking the compass reading, about 6 inches was enough (without getting it out and double checking)
The affect the disto has on a compass had been noted before when we had tried to duct tape a regular compass to the back of it to make a survey unit. The compass stops going round, which is OK for surveying a dead straight mine tunnel, but not too good in a cave.
I'm blaming the closure error on a combination of early onset Parkinson's and DTs.