Exam Question: What options exist for the Gunners to provide accurate survey under conditions of GPS denial? Most modern systems on the battlefield use some form of positioning system, and most of these are reliant on GPS, possibled coupled to an INS of some description. But what do we do when GPS is denied? Revert to thumbprint and prismatic compass? Hope to find nicely marked out trig points to park over? Serious question - any genuinely serious answers and solutions gratefully received. Many thanks.