'build a Pi+Adafruit GPS module in the past and given up realising it needs line of sight to work (or external antenna)'
FYI - non-Bangle - I used the inexpensive Ublox NEO-6M GPS Module and was able to get a minimum of five, usually eight satellite fixes in under a minute, when indoors fifteen feet from sliding patio door. No line of sight. Used their antenna - see images at page bottom
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Tue 2020.01.14
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FYI - non-Bangle - I used the inexpensive Ublox NEO-6M GPS Module and was able to get a minimum of five, usually eight satellite fixes in under a minute, when indoors fifteen feet from sliding patio door. No line of sight. Used their antenna - see images at page bottom