Hi, All! I've tried to parse the problem map from the wiki http://www.osmaustralia.org/garminroute/VIC_route.img.zip w/ libgarmin's gartest. And here are the results: garmin_subdiv.c:370:1|Error have 1 points but datalen is 1, bpx=2, bpy=2 si.sign_info_bits=4 garmin_subdiv.c:371:1|dp=05 extra_bit=1 bs_info=00 garmin_subdiv.c:376:1|05 This comes quite often - looks like the extra_bit is not accounted correctly. 4+2+2 = 8 but with extra bit it's 9. There are some garmin_subdiv.c:200:15|Point 1 have zero deltas eb=1 which means that deltas from the bitstream are 0 only the extrabit is set. garmin_net.c:469:1|SF:63242702 SD:2022 l=0 ot=3 idx=83 gt=0x06(0) lng=150.880587 lat=-34.388967 d:0 sc:0 eb:1 dt:6 garmin_net.c:478:1|1 150.880587/-34.388967 (6b4af9/ffe78bae) garmin_net.c:486:1|1 150.880930/-34.387057 (6b4b09/ffe78c07) e=0 garmin_net.c:486:1|2 150.880952/-34.386992 (6b4b0a/ffe78c0a) e=0 garmin_net.c:486:1|3 150.881402/-34.385684 (6b4b1f/ffe78c47) e=1 garmin_net.c:486:1|4 150.881531/-34.384761 (6b4b25/ffe78c72) e=0 garmin_net.c:486:1|5 150.882239/-34.381135 (6b4b46/ffe78d1b) e=1 garmin_net.c:486:1|6 150.882518/-34.380705 (6b4b53/ffe78d2f) e=1 garmin_net.c:502:1|segments:0 i:83 sd:2022 garmin_net.c:508:1|NOD info at 616790 garmin_net.c:517:1|NOD1 at 3120649 bmlen=5 fb=1 garmin_net.c:522:1|NET: BITMAP: 1f Here the bmlen should be 4. I'll look for more later. -- have fun, alex