Re: recommendations for altime
Re: the Silva as above, few first thoughts; I've had it out for a couple of runs in the flat East Cheshire countryside, and the Macc Forest/ Shutlingslow area.
1. Bigger than I expected; dial is 2" across, total diameter 2.5", length 4".
Sits very comfortably in L hand due to 'comma' shape and feel. Lightweight but robust. Decent clip-on lanyard.
Feels like a quality bit of kit. Smooth/ soft touch grey and black plastic.
Dial stiff enough to not need a separate lock, allows fine adjustment(calibration)
2. Range 0-5000m. Clearly more than I need. This is the only drawback for my main purpose(navigation in UK/ OMM etc) Graduations in 20m/ 5kPa. As the height graduations are in 20m, it is possible to be 'accurate' down to 10m(assuming good close vision!)
Known height set by rotating bezel, which moves outer height dial. Inner pressure dial static
3. responsive to changes, and needle rock-steady.
- in rural Swettenham, up and down over the Dane river, it is easy to pick out the +/-30m height difference
- from Macclesfield to Macc Forest, and up and over Shutlingslow(500m), easily corresponds with spot heights on OS 1:25,000 map and Garmin 305. Set in Macc at known height(90m). Of course does vary with conditions, and I suspect this will be the challenge - allowing for weather and/or using it to predict weather. I may even have a go up and down the stairs at work to see how much I can trust it!
As I've not had to use it in clag in unknown territory yet, I'll reserve full judgement. However, no disappointment so far, and as the good people at Campfour only charged £32, with their shop discount card scheme, I'm very happy.
wrt the OMM, if using Harveys-type 1:40,000 maps with 15m counter interval/ 75m index countours I'm optimistic it will be useful additional check for nav e.g. contouring, using it as a guide up or down to checkpoint from an attack point, or in addition to other features e.g. if following a handrail across contour lines
Avatar: snowman on trig point, Bosley Cloud, Feb 09