40, 80, 110, 130, 140 & 200 are all Tough Solar, Triple Sensor (Barometer, Thermometer, Altimeter) watches.

T - indicates the strap is made from titanium, which makes the watch light and lasting.

GB or GC- indicates model comes with resin and additional fabric strap and no alphabet after model number indicates watch comes in stainless steel band.

Watch face

40, 80 and the new 200 models have a (duplex navigational pointer) blue cross indicating the compass, whereas the 110, 130 and 140 models don't have this blue cross.

Watch face for 110, 140 and 200 are quite similar, but the 130 shows a tide graph

Water Resistant

All models are water resistant 100M, except the 130 which is 200M

Model Additional Features

Model 80 has an additional Yacht race timer and Height gain - suitable for the sea and mountains.

Model 130 is suitable for divers - has an additional tide graph and moon data functions.

Model 140 does not have a compass

Model 200 being brand new has the following additional features:-

selectable illumination duration, bearing memory, low altitude memory, total ascent / descent memory, altitude differential, duplex LC display, 31 time zones 48 cities, sunrise/sunset time display for specific date, daylight pointers, countdown timer range to 24 hours.accuracy 15 sec/month, 23 months on rechargeable battery, lighter weight 69g/107g and size 56.2 x 50.2 x 11.3 mm compared to the 130 size 56.2 x 50.6 x 13.9 mm l 

Size

Model 110 and 200 are the slimmest models - suitable for ladies and smaller wrists

Hope this summary helps and look forward to serve you soon.