Here is an excellent read (with the occasional typographic error) for anyone who ventures in the wilds. The US Navy SEAL Survival Handbook.
Some years ago together with a colleague I was doing geological traverses across the Earaheedy Basin in the deserts of Western Australia – in January. Mapping along a traverse and only navigating with a compass in the early morning, I walked across the stratigraphy and then reversed course to locate the vehicle parked in thick scrub. My colleague was several kilometres away exploring access options to the west.
Counting paces (before portable GPS) I returned on the reverse compass bearing but could not locate the vehicle. Given that midday temperatures were in the high 40s I quickly realised that this was a potentially life threatening event. Important in this situation not panic. I sat down had a cup of tea and a biscuit and developed a strategy. I very carefully walked to the east 400 metres – no vehicle. I retraced my steps and traversed a mere 100 metres to the west to locate the vehicle.
An excellent read with entertaining anecdotes and much useful information. The overarching message, go prepared and when faced with a challenge avoid panic, sit and have a cup of tea and a biscuit.
The leeches comment is on page 218.