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Bonnington Traverse - Trip Report
Timestamp Free: 2020.03.31 - 16:09:47
Ranges: North America Ranges / Columbia Mountains / Selkirk Mountains / Bonnington Range
  (4 days)
Participants: Robin Tivy, Jim Tivy, Betsy Waddington
Difficulty: 3: One narrow traverse on final day.
This report focuses on navigation in some difficult conditions. It describes the maps, route descriptions and GPS techniques that we used.
Although this trip has been written up well by Sandra, I will write up our experiences, because it was one of the few experiences I have in following someone else's route description, and using the GPS and bivouac topo maps we printed.

On Monday April 15, we drove up from Nelson where we were visiting and left the car at the Bombi summit parking lot. It was raining lightly, as we left, skiing up the power line over numerous snowmobile tracks. We more or less followed the powerline. For navigation, we had the following:
 1. Bonnington Traverse - Route Description (on a e-reader)
 2. A set of 4 "GMap" 1:50k printouts for Sandra's Route
 3. A higher quality 1:50K topo map from the GoTrekkers Digital Map Package. We had taped together two adjacent sheets.
 4. A Garmin Oregon GPS with the garmin Mapsource maps on it. (1:50K contours, but no color)

We occasionally checked our position on the GPS to see where we were on the paper map. The GPS was configured to read WGS84 Datum, which is the same as the datum for the metric version of the 1:50K map we were using. At the head of McPhee Creek we left the powerline and headed east, up the slopes of Grassy mountain. We had lunch shortly afterwards. [photo]992_JimLunch.jpg[caption]My brother, Jim Tivy digging out his food.[/photo]

It was still sleeting steadily, so we put on rain pants. After lunch, we climbed up through the trees to the col between Grassy Mountain and the single contour bump about 1.5 km southwest. The snow was heavy and clumped onto my skis, making them 10 ton weights, so I was pretty slow.

When we reached the col, I caught up with Jim and Betsy and Jim gave me the co-ordinates for the Grassy Hut. I input them into the GPS by taking an extra waypoint at the col, then editing the UTM...

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