islip1602-t Published September 26, 2016 at 1080 × 940 in 2016 Hikes Track map for 2016 Hike #57 Crystal Lake to Mt. Islip-1601 using Backcountry Navigator (US Forest Service-2013 map) from my phone. Track map for 2016 Hike #57 Crystal Lake to Mt. Islip-1601 using Backcountry Navigator (US Forest Service-2013 map) from my phone.